{
 "documentInfo": {
  "documentType": "https://xbrl.org/2021/xbrl-json",
  "features": {
   "xbrl:canonicalValues": true
  },
  "namespaces": {
   "eni": "http://www.eni.com/xbrl/2021",
   "ifrs-full": "http://xbrl.ifrs.org/taxonomy/2020-03-16/ifrs-full",
   "iso4217": "http://www.xbrl.org/2003/iso4217",
   "scheme": "http://standards.iso.org/iso/17442",
   "xbrl": "https://xbrl.org/2021",
   "xbrli": "http://www.xbrl.org/2003/instance"
  },
  "linkTypes": {
   "ftTyp_fact-footnote": "http://www.xbrl.org/2003/arcrole/fact-footnote"
  },
  "linkGroups": {
   "ftGrp_default": "http://www.xbrl.org/2003/role/link"
  },
  "taxonomy": [
   "http://www.eni.com/xbrl/2021/BUCRF72VH5RBN7X3VL35-2021-12-31.xsd"
  ]
 },
 "facts": {
  "Tag8": {
   "value": "8254000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CashAndCashEquivalents",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag29": {
   "value": "9413000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CashAndCashEquivalents",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag9": {
   "value": "6301000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CurrentFinancialAssetsAtFairValueThroughProfitOrLossClassifiedAsHeldForTrading",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag30": {
   "value": "5502000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CurrentFinancialAssetsAtFairValueThroughProfitOrLossClassifiedAsHeldForTrading",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag10": {
   "value": "4308000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherCurrentFinancialAssets",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag100": {
   "value": "55000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherCurrentFinancialAssets",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2022-01-01T00:00:00",
    "ifrs-full:CategoriesOfRelatedPartiesAxis": "ifrs-full:RelatedPartiesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag31": {
   "value": "254000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherCurrentFinancialAssets",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag101": {
   "value": "41000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherCurrentFinancialAssets",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00",
    "ifrs-full:CategoriesOfRelatedPartiesAxis": "ifrs-full:RelatedPartiesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag11": {
   "value": "18850000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:TradeAndOtherCurrentReceivables",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag102": {
   "value": "1301000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:TradeAndOtherCurrentReceivables",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2022-01-01T00:00:00",
    "ifrs-full:CategoriesOfRelatedPartiesAxis": "ifrs-full:RelatedPartiesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag32": {
   "value": "10926000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:TradeAndOtherCurrentReceivables",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag103": {
   "value": "802000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:TradeAndOtherCurrentReceivables",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00",
    "ifrs-full:CategoriesOfRelatedPartiesAxis": "ifrs-full:RelatedPartiesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag12": {
   "value": "6072000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:Inventories",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag33": {
   "value": "3893000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:Inventories",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag13": {
   "value": "195000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CurrentTaxAssetsCurrent",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag34": {
   "value": "184000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CurrentTaxAssetsCurrent",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag14": {
   "value": "13634000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherCurrentAssets",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag104": {
   "value": "492000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherCurrentAssets",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2022-01-01T00:00:00",
    "ifrs-full:CategoriesOfRelatedPartiesAxis": "ifrs-full:RelatedPartiesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag35": {
   "value": "2686000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherCurrentAssets",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag105": {
   "value": "145000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherCurrentAssets",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00",
    "ifrs-full:CategoriesOfRelatedPartiesAxis": "ifrs-full:RelatedPartiesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag15": {
   "value": "57614000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CurrentAssetsOtherThanAssetsOrDisposalGroupsClassifiedAsHeldForSaleOrAsHeldForDistributionToOwners",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag36": {
   "value": "32858000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CurrentAssetsOtherThanAssetsOrDisposalGroupsClassifiedAsHeldForSaleOrAsHeldForDistributionToOwners",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag16": {
   "value": "56299000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:PropertyPlantAndEquipment",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag37": {
   "value": "53943000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:PropertyPlantAndEquipment",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag17": {
   "value": "4821000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:RightofuseAssets",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag38": {
   "value": "4643000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:RightofuseAssets",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag18": {
   "value": "4799000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:IntangibleAssetsAndGoodwill",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag39": {
   "value": "2936000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:IntangibleAssetsAndGoodwill",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag19": {
   "value": "1053000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:NoncurrentInventories",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag40": {
   "value": "995000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:NoncurrentInventories",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag20": {
   "value": "5887000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:InvestmentAccountedForUsingEquityMethod",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag41": {
   "value": "6749000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:InvestmentAccountedForUsingEquityMethod",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag21": {
   "value": "1294000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:NoncurrentInvestmentsOtherThanInvestmentsAccountedForUsingEquityMethod",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag42": {
   "value": "957000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:NoncurrentInvestmentsOtherThanInvestmentsAccountedForUsingEquityMethod",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag22": {
   "value": "1885000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherNoncurrentFinancialAssets",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag106": {
   "value": "1645000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherNoncurrentFinancialAssets",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2022-01-01T00:00:00",
    "ifrs-full:CategoriesOfRelatedPartiesAxis": "ifrs-full:RelatedPartiesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag43": {
   "value": "1008000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherNoncurrentFinancialAssets",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag107": {
   "value": "766000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherNoncurrentFinancialAssets",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00",
    "ifrs-full:CategoriesOfRelatedPartiesAxis": "ifrs-full:RelatedPartiesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag23": {
   "value": "2713000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:NetDeferredTaxAssets",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag44": {
   "value": "4109000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:NetDeferredTaxAssets",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag24": {
   "value": "108000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CurrentTaxAssetsNoncurrent",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag45": {
   "value": "153000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CurrentTaxAssetsNoncurrent",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag25": {
   "value": "1029000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherNoncurrentAssets",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag108": {
   "value": "29000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherNoncurrentAssets",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2022-01-01T00:00:00",
    "ifrs-full:CategoriesOfRelatedPartiesAxis": "ifrs-full:RelatedPartiesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag46": {
   "value": "1253000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherNoncurrentAssets",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag109": {
   "value": "74000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherNoncurrentAssets",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00",
    "ifrs-full:CategoriesOfRelatedPartiesAxis": "ifrs-full:RelatedPartiesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag26": {
   "value": "79888000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:NoncurrentAssets",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag47": {
   "value": "76746000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:NoncurrentAssets",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag27": {
   "value": "263000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:NoncurrentAssetsOrDisposalGroupsClassifiedAsHeldForSale",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag48": {
   "value": "44000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:NoncurrentAssetsOrDisposalGroupsClassifiedAsHeldForSale",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag28": {
   "value": "137765000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:Assets",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag49": {
   "value": "109648000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:Assets",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag50": {
   "value": "2299000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ShorttermBorrowings",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag110": {
   "value": "233000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ShorttermBorrowings",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2022-01-01T00:00:00",
    "ifrs-full:CategoriesOfRelatedPartiesAxis": "ifrs-full:RelatedPartiesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag76": {
   "value": "2882000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ShorttermBorrowings",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag111": {
   "value": "52000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ShorttermBorrowings",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00",
    "ifrs-full:CategoriesOfRelatedPartiesAxis": "ifrs-full:RelatedPartiesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag51": {
   "value": "1781000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CurrentPortionOfLongtermBorrowings",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag112": {
   "value": "21000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CurrentPortionOfLongtermBorrowings",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2022-01-01T00:00:00",
    "ifrs-full:CategoriesOfRelatedPartiesAxis": "ifrs-full:RelatedPartiesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag77": {
   "value": "1909000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CurrentPortionOfLongtermBorrowings",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag52": {
   "value": "948000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CurrentLeaseLiabilities",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag113": {
   "value": "17000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CurrentLeaseLiabilities",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2022-01-01T00:00:00",
    "ifrs-full:CategoriesOfRelatedPartiesAxis": "ifrs-full:RelatedPartiesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag78": {
   "value": "849000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CurrentLeaseLiabilities",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag114": {
   "value": "54000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CurrentLeaseLiabilities",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00",
    "ifrs-full:CategoriesOfRelatedPartiesAxis": "ifrs-full:RelatedPartiesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag53": {
   "value": "21720000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:TradeAndOtherCurrentPayables",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag115": {
   "value": "2298000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:TradeAndOtherCurrentPayables",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2022-01-01T00:00:00",
    "ifrs-full:CategoriesOfRelatedPartiesAxis": "ifrs-full:RelatedPartiesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag79": {
   "value": "12936000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:TradeAndOtherCurrentPayables",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag116": {
   "value": "2100000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:TradeAndOtherCurrentPayables",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00",
    "ifrs-full:CategoriesOfRelatedPartiesAxis": "ifrs-full:RelatedPartiesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag54": {
   "value": "648000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CurrentTaxLiabilitiesCurrent",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag80": {
   "value": "243000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CurrentTaxLiabilitiesCurrent",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag55": {
   "value": "15756000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherCurrentLiabilities",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag117": {
   "value": "339000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherCurrentLiabilities",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2022-01-01T00:00:00",
    "ifrs-full:CategoriesOfRelatedPartiesAxis": "ifrs-full:RelatedPartiesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag81": {
   "value": "4872000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherCurrentLiabilities",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag118": {
   "value": "452000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherCurrentLiabilities",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00",
    "ifrs-full:CategoriesOfRelatedPartiesAxis": "ifrs-full:RelatedPartiesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag56": {
   "value": "43152000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CurrentLiabilitiesOtherThanLiabilitiesIncludedInDisposalGroupsClassifiedAsHeldForSale",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag82": {
   "value": "23691000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CurrentLiabilitiesOtherThanLiabilitiesIncludedInDisposalGroupsClassifiedAsHeldForSale",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag57": {
   "value": "23714000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:LongtermBorrowings",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag119": {
   "value": "5000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:LongtermBorrowings",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2022-01-01T00:00:00",
    "ifrs-full:CategoriesOfRelatedPartiesAxis": "ifrs-full:RelatedPartiesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag83": {
   "value": "21895000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:LongtermBorrowings",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag58": {
   "value": "4389000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:NoncurrentLeaseLiabilities",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag120": {
   "value": "1000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:NoncurrentLeaseLiabilities",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2022-01-01T00:00:00",
    "ifrs-full:CategoriesOfRelatedPartiesAxis": "ifrs-full:RelatedPartiesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag84": {
   "value": "4169000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:NoncurrentLeaseLiabilities",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag121": {
   "value": "112000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:NoncurrentLeaseLiabilities",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00",
    "ifrs-full:CategoriesOfRelatedPartiesAxis": "ifrs-full:RelatedPartiesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag59": {
   "value": "13593000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherLongtermProvisions",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag85": {
   "value": "13438000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherLongtermProvisions",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag60": {
   "value": "819000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:NoncurrentProvisionsForEmployeeBenefits",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag86": {
   "value": "1201000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:NoncurrentProvisionsForEmployeeBenefits",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag61": {
   "value": "4835000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:NetDeferredTaxLiabilities",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag87": {
   "value": "5524000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:NetDeferredTaxLiabilities",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag62": {
   "value": "374000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CurrentTaxLiabilitiesNoncurrent",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag88": {
   "value": "360000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CurrentTaxLiabilitiesNoncurrent",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag63": {
   "value": "2246000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherNoncurrentLiabilities",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag122": {
   "value": "415000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherNoncurrentLiabilities",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2022-01-01T00:00:00",
    "ifrs-full:CategoriesOfRelatedPartiesAxis": "ifrs-full:RelatedPartiesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag89": {
   "value": "1877000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherNoncurrentLiabilities",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag123": {
   "value": "23000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherNoncurrentLiabilities",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00",
    "ifrs-full:CategoriesOfRelatedPartiesAxis": "ifrs-full:RelatedPartiesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag64": {
   "value": "49970000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:NoncurrentLiabilities",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag90": {
   "value": "48464000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:NoncurrentLiabilities",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag65": {
   "value": "124000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:LiabilitiesIncludedInDisposalGroupsClassifiedAsHeldForSale",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag66": {
   "value": "93246000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:Liabilities",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag91": {
   "value": "72155000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:Liabilities",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag67": {
   "value": "4005000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:IssuedCapital",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag92": {
   "value": "4005000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:IssuedCapital",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag125": {
   "value": "22750000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:RetainedEarningsExcludingProfitLossForReportingPeriod",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag126": {
   "value": "34043000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:RetainedEarningsExcludingProfitLossForReportingPeriod",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag68": {
   "value": "6530000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ReserveOfExchangeDifferencesOnTranslation",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag93": {
   "value": "3895000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ReserveOfExchangeDifferencesOnTranslation",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag69": {
   "value": "6289000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherReserves",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag94": {
   "value": "4688000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherReserves",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag70": {
   "value": "958000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:TreasuryShares",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag95": {
   "value": "581000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:TreasuryShares",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag71": {
   "value": "5821000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:ProfitOrLossAttributableToOwnersOfParent",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag124": {
   "value": "-8635000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:ProfitOrLossAttributableToOwnersOfParent",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag72": {
   "value": "44437000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:EquityAttributableToOwnersOfParent",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag96": {
   "value": "37415000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:EquityAttributableToOwnersOfParent",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag73": {
   "value": "82000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:NoncontrollingInterests",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag97": {
   "value": "78000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:NoncontrollingInterests",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag74": {
   "value": "44519000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:Equity",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag98": {
   "value": "37493000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:Equity",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag75": {
   "value": "137765000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:EquityAndLiabilities",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag99": {
   "value": "109648000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:EquityAndLiabilities",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag466": {
   "value": "76575000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:RevenueFromContractsWithCustomers",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag525": {
   "value": "3000000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:RevenueFromContractsWithCustomers",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:CategoriesOfRelatedPartiesAxis": "ifrs-full:RelatedPartiesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag487": {
   "value": "43987000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:RevenueFromContractsWithCustomers",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag526": {
   "value": "1164000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:RevenueFromContractsWithCustomers",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:CategoriesOfRelatedPartiesAxis": "ifrs-full:RelatedPartiesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag502": {
   "value": "69881000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:RevenueFromContractsWithCustomers",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag527": {
   "value": "1248000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:RevenueFromContractsWithCustomers",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "ifrs-full:CategoriesOfRelatedPartiesAxis": "ifrs-full:RelatedPartiesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag566": {
   "value": "1196000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:OtherIncomeAndRevenues",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag528": {
   "value": "52000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:OtherIncomeAndRevenues",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:CategoriesOfRelatedPartiesAxis": "ifrs-full:RelatedPartiesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag488": {
   "value": "960000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:OtherIncomeAndRevenues",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag529": {
   "value": "35000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:OtherIncomeAndRevenues",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:CategoriesOfRelatedPartiesAxis": "ifrs-full:RelatedPartiesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag503": {
   "value": "1160000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:OtherIncomeAndRevenues",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag530": {
   "value": "4000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:OtherIncomeAndRevenues",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "ifrs-full:CategoriesOfRelatedPartiesAxis": "ifrs-full:RelatedPartiesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag467": {
   "value": "77771000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:RevenueAndOtherIncome",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag489": {
   "value": "44947000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:RevenueAndOtherIncome",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag504": {
   "value": "71041000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:RevenueAndOtherIncome",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag468": {
   "value": "55549000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:TotalPurchasesServicesAndOtherCosts",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag531": {
   "value": "8644000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:TotalPurchasesServicesAndOtherCosts",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:CategoriesOfRelatedPartiesAxis": "ifrs-full:RelatedPartiesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag490": {
   "value": "33551000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:TotalPurchasesServicesAndOtherCosts",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag532": {
   "value": "6595000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:TotalPurchasesServicesAndOtherCosts",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:CategoriesOfRelatedPartiesAxis": "ifrs-full:RelatedPartiesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag505": {
   "value": "50874000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:TotalPurchasesServicesAndOtherCosts",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag533": {
   "value": "9173000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:TotalPurchasesServicesAndOtherCosts",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "ifrs-full:CategoriesOfRelatedPartiesAxis": "ifrs-full:RelatedPartiesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag469": {
   "value": "279000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLossTradeReceivables",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag534": {
   "value": "6000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLossTradeReceivables",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:CategoriesOfRelatedPartiesAxis": "ifrs-full:RelatedPartiesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag491": {
   "value": "226000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLossTradeReceivables",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag535": {
   "value": "6000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLossTradeReceivables",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:CategoriesOfRelatedPartiesAxis": "ifrs-full:RelatedPartiesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag506": {
   "value": "432000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLossTradeReceivables",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag536": {
   "value": "28000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLossTradeReceivables",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "ifrs-full:CategoriesOfRelatedPartiesAxis": "ifrs-full:RelatedPartiesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag470": {
   "value": "2888000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:EmployeeBenefitsExpense",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag537": {
   "value": "21000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:EmployeeBenefitsExpense",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:CategoriesOfRelatedPartiesAxis": "ifrs-full:RelatedPartiesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag492": {
   "value": "2863000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:EmployeeBenefitsExpense",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag538": {
   "value": "36000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:EmployeeBenefitsExpense",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:CategoriesOfRelatedPartiesAxis": "ifrs-full:RelatedPartiesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag507": {
   "value": "2996000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:EmployeeBenefitsExpense",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag539": {
   "value": "28000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:EmployeeBenefitsExpense",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "ifrs-full:CategoriesOfRelatedPartiesAxis": "ifrs-full:RelatedPartiesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag471": {
   "value": "903000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherOperatingIncomeExpense",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag540": {
   "value": "735000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherOperatingIncomeExpense",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:CategoriesOfRelatedPartiesAxis": "ifrs-full:RelatedPartiesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag565": {
   "value": "-766000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherOperatingIncomeExpense",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag541": {
   "value": "13000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherOperatingIncomeExpense",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:CategoriesOfRelatedPartiesAxis": "ifrs-full:RelatedPartiesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag508": {
   "value": "287000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherOperatingIncomeExpense",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag542": {
   "value": "19000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherOperatingIncomeExpense",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "ifrs-full:CategoriesOfRelatedPartiesAxis": "ifrs-full:RelatedPartiesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag472": {
   "value": "7063000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:DepreciationAndAmortisationExpense",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag493": {
   "value": "7304000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:DepreciationAndAmortisationExpense",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag509": {
   "value": "8106000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:DepreciationAndAmortisationExpense",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag473": {
   "value": "167000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLoss",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag567": {
   "value": "3183000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLoss",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag510": {
   "value": "2188000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLoss",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag474": {
   "value": "387000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:WriteOffOfTangibleAndIntangibleAssets",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag494": {
   "value": "329000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:WriteOffOfTangibleAndIntangibleAssets",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag511": {
   "value": "300000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:WriteOffOfTangibleAndIntangibleAssets",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag475": {
   "value": "12341000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ProfitLossFromOperatingActivities",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag564": {
   "value": "-3275000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ProfitLossFromOperatingActivities",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag512": {
   "value": "6432000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ProfitLossFromOperatingActivities",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag476": {
   "value": "3723000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:FinanceIncome",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag543": {
   "value": "79000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:FinanceIncome",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:CategoriesOfRelatedPartiesAxis": "ifrs-full:RelatedPartiesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag495": {
   "value": "3531000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:FinanceIncome",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag544": {
   "value": "114000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:FinanceIncome",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:CategoriesOfRelatedPartiesAxis": "ifrs-full:RelatedPartiesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag513": {
   "value": "3087000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:FinanceIncome",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag545": {
   "value": "96000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:FinanceIncome",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "ifrs-full:CategoriesOfRelatedPartiesAxis": "ifrs-full:RelatedPartiesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag477": {
   "value": "4216000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:FinanceCosts",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag546": {
   "value": "46000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:FinanceCosts",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:CategoriesOfRelatedPartiesAxis": "ifrs-full:RelatedPartiesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag496": {
   "value": "4958000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:FinanceCosts",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag547": {
   "value": "26000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:FinanceCosts",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:CategoriesOfRelatedPartiesAxis": "ifrs-full:RelatedPartiesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag514": {
   "value": "4079000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:FinanceCosts",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag548": {
   "value": "36000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:FinanceCosts",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "ifrs-full:CategoriesOfRelatedPartiesAxis": "ifrs-full:RelatedPartiesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag478": {
   "value": "11000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:GainsLossesOnFinancialAssetsAtFairValueThroughProfitOrLossClassifiedAsHeldForTrading",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag497": {
   "value": "31000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:GainsLossesOnFinancialAssetsAtFairValueThroughProfitOrLossClassifiedAsHeldForTrading",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag515": {
   "value": "127000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:GainsLossesOnFinancialAssetsAtFairValueThroughProfitOrLossClassifiedAsHeldForTrading",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag563": {
   "value": "-306000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:GainsLossesOnChangeInFairValueOfDerivatives",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag498": {
   "value": "351000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:GainsLossesOnChangeInFairValueOfDerivatives",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag558": {
   "value": "-14000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:GainsLossesOnChangeInFairValueOfDerivatives",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag562": {
   "value": "-788000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:FinanceIncomeCost",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag560": {
   "value": "-1045000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:FinanceIncomeCost",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag557": {
   "value": "-879000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:FinanceIncomeCost",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag561": {
   "value": "-1091000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:ShareOfProfitLossOfEquityAccountedInvestments",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag559": {
   "value": "-1733000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:ShareOfProfitLossOfEquityAccountedInvestments",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag556": {
   "value": "-88000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:ShareOfProfitLossOfEquityAccountedInvestments",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag479": {
   "value": "223000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:OtherIncomeExpenseFromInvestments",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag499": {
   "value": "75000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:OtherIncomeExpenseFromInvestments",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag516": {
   "value": "281000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:OtherIncomeExpenseFromInvestments",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag555": {
   "value": "-868000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:InvestmentIncomeExpense",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag554": {
   "value": "-1658000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:InvestmentIncomeExpense",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag517": {
   "value": "193000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:InvestmentIncomeExpense",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag480": {
   "value": "10685000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ProfitLossBeforeTax",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag553": {
   "value": "-5978000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ProfitLossBeforeTax",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag518": {
   "value": "5746000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ProfitLossBeforeTax",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag481": {
   "value": "4845000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:IncomeTaxExpenseContinuingOperations",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag500": {
   "value": "2650000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:IncomeTaxExpenseContinuingOperations",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag519": {
   "value": "5591000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:IncomeTaxExpenseContinuingOperations",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag482": {
   "value": "5840000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ProfitLoss",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag552": {
   "value": "-8628000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ProfitLoss",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag520": {
   "value": "155000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ProfitLoss",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag483": {
   "value": "5821000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ProfitLossAttributableToOwnersOfParent",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag551": {
   "value": "-8635000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ProfitLossAttributableToOwnersOfParent",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag521": {
   "value": "148000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ProfitLossAttributableToOwnersOfParent",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag484": {
   "value": "19000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ProfitLossAttributableToNoncontrollingInterests",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag501": {
   "value": "7000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ProfitLossAttributableToNoncontrollingInterests",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag522": {
   "value": "7000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ProfitLossAttributableToNoncontrollingInterests",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag485": {
   "value": "1.61",
   "decimals": 2,
   "dimensions": {
    "concept": "ifrs-full:BasicEarningsLossPerShare",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR/xbrli:shares"
   }
  },
  "Tag550": {
   "value": "-2.42",
   "decimals": 2,
   "dimensions": {
    "concept": "ifrs-full:BasicEarningsLossPerShare",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR/xbrli:shares"
   }
  },
  "Tag523": {
   "value": "0.04",
   "decimals": 2,
   "dimensions": {
    "concept": "ifrs-full:BasicEarningsLossPerShare",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "unit": "iso4217:EUR/xbrli:shares"
   }
  },
  "Tag486": {
   "value": "1.6",
   "decimals": 2,
   "dimensions": {
    "concept": "ifrs-full:DilutedEarningsLossPerShare",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR/xbrli:shares"
   }
  },
  "Tag549": {
   "value": "-2.42",
   "decimals": 2,
   "dimensions": {
    "concept": "ifrs-full:DilutedEarningsLossPerShare",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR/xbrli:shares"
   }
  },
  "Tag524": {
   "value": "0.04",
   "decimals": 2,
   "dimensions": {
    "concept": "ifrs-full:DilutedEarningsLossPerShare",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "unit": "iso4217:EUR/xbrli:shares"
   }
  },
  "Tag127": {
   "value": "5840000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ProfitLoss",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag170": {
   "value": "-8628000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ProfitLoss",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag145": {
   "value": "155000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ProfitLoss",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag128": {
   "value": "119000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeBeforeTaxGainsLossesOnRemeasurementsOfDefinedBenefitPlans",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag169": {
   "value": "-16000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeBeforeTaxGainsLossesOnRemeasurementsOfDefinedBenefitPlans",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag168": {
   "value": "-42000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeBeforeTaxGainsLossesOnRemeasurementsOfDefinedBenefitPlans",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag129": {
   "value": "2000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:ShareOfOtherComprehensiveIncomeLossOfEquityAccountedInvestmentsThatWillNotBeReclassifiedToProfitOrLossBeforeTax",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag167": {
   "value": "-7000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:ShareOfOtherComprehensiveIncomeLossOfEquityAccountedInvestmentsThatWillNotBeReclassifiedToProfitOrLossBeforeTax",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag130": {
   "value": "105000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeBeforeTaxGainsLossesFromInvestmentsInEquityInstruments",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag139": {
   "value": "24000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeBeforeTaxGainsLossesFromInvestmentsInEquityInstruments",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag166": {
   "value": "-3000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeBeforeTaxGainsLossesFromInvestmentsInEquityInstruments",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag131": {
   "value": "77000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:IncomeTaxRelatingToComponentsOfOtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLoss",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag163": {
   "value": "-25000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:IncomeTaxRelatingToComponentsOfOtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLoss",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag165": {
   "value": "-5000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:IncomeTaxRelatingToComponentsOfOtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLoss",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag132": {
   "value": "149000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossNetOfTax",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag140": {
   "value": "33000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossNetOfTax",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag164": {
   "value": "-47000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossNetOfTax",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag133": {
   "value": "2828000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeBeforeTaxExchangeDifferencesOnTranslation",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag162": {
   "value": "-3314000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeBeforeTaxExchangeDifferencesOnTranslation",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag146": {
   "value": "604000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeBeforeTaxExchangeDifferencesOnTranslation",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag161": {
   "value": "-1264000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeBeforeTaxCashFlowHedges",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag141": {
   "value": "661000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeBeforeTaxCashFlowHedges",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag158": {
   "value": "-679000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeBeforeTaxCashFlowHedges",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag160": {
   "value": "-34000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:ShareOfOtherComprehensiveIncomeLossOfEquityAccountedInvestmentsThatWillBeReclassifiedToProfitOrLossBeforeTax",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag142": {
   "value": "32000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:ShareOfOtherComprehensiveIncomeLossOfEquityAccountedInvestmentsThatWillBeReclassifiedToProfitOrLossBeforeTax",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag157": {
   "value": "-6000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:ShareOfOtherComprehensiveIncomeLossOfEquityAccountedInvestmentsThatWillBeReclassifiedToProfitOrLossBeforeTax",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag159": {
   "value": "-372000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:IncomeTaxRelatingToComponentsOfOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLoss",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag143": {
   "value": "192000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:IncomeTaxRelatingToComponentsOfOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLoss",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag156": {
   "value": "-197000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:IncomeTaxRelatingToComponentsOfOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLoss",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag134": {
   "value": "1902000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossNetOfTax",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag155": {
   "value": "-2813000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossNetOfTax",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag147": {
   "value": "116000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossNetOfTax",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag135": {
   "value": "2051000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncome",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag154": {
   "value": "-2780000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncome",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag148": {
   "value": "69000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncome",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag136": {
   "value": "7891000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ComprehensiveIncome",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag153": {
   "value": "-11408000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ComprehensiveIncome",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag149": {
   "value": "224000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ComprehensiveIncome",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag137": {
   "value": "7872000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ComprehensiveIncomeAttributableToOwnersOfParent",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag152": {
   "value": "-11415000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ComprehensiveIncomeAttributableToOwnersOfParent",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag150": {
   "value": "217000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ComprehensiveIncomeAttributableToOwnersOfParent",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag138": {
   "value": "19000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ComprehensiveIncomeAttributableToNoncontrollingInterests",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag144": {
   "value": "7000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ComprehensiveIncomeAttributableToNoncontrollingInterests",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag151": {
   "value": "7000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ComprehensiveIncomeAttributableToNoncontrollingInterests",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag189": {
   "value": "4005000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:Equity",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:IssuedCapitalMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag191": {
   "value": "34043000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:Equity",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "eni:RetainedEarningsExcludingProfitLossForReportingPeriodMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag200": {
   "value": "3895000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:Equity",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:ReserveOfExchangeDifferencesOnTranslationMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag205": {
   "value": "4688000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:Equity",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:OtherReservesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag270": {
   "value": "-581000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:Equity",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:TreasurySharesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag269": {
   "value": "-8635000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:Equity",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "eni:ProfitLossAttributableToOwnersOfParentMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag222": {
   "value": "37415000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:Equity",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:EquityAttributableToOwnersOfParentMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag238": {
   "value": "78000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:Equity",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:NoncontrollingInterestsMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag171": {
   "value": "37493000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:Equity",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag216": {
   "value": "5821000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ProfitLoss",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "eni:ProfitLossAttributableToOwnersOfParentMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag223": {
   "value": "5821000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ProfitLoss",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:EquityAttributableToOwnersOfParentMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag239": {
   "value": "19000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ProfitLoss",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:NoncontrollingInterestsMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag173": {
   "value": "5840000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ProfitLoss",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag206": {
   "value": "42000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeNetOfTaxGainsLossesOnRemeasurementsOfDefinedBenefitPlans",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:OtherReservesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag224": {
   "value": "42000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeNetOfTaxGainsLossesOnRemeasurementsOfDefinedBenefitPlans",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:EquityAttributableToOwnersOfParentMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag174": {
   "value": "42000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeNetOfTaxGainsLossesOnRemeasurementsOfDefinedBenefitPlans",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag461": {
   "value": "2000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:ShareOfOtherComprehensiveIncomeLossOfEquityAccountedInvestmentsThatWillNotBeReclassifiedToProfitOrLossNetOfTax",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:OtherReservesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag462": {
   "value": "2000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:ShareOfOtherComprehensiveIncomeLossOfEquityAccountedInvestmentsThatWillNotBeReclassifiedToProfitOrLossNetOfTax",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:EquityAttributableToOwnersOfParentMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag460": {
   "value": "2000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:ShareOfOtherComprehensiveIncomeLossOfEquityAccountedInvestmentsThatWillNotBeReclassifiedToProfitOrLossNetOfTax",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag207": {
   "value": "105000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeNetOfTaxGainsLossesFromInvestmentsInEquityInstruments",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:OtherReservesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag225": {
   "value": "105000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeNetOfTaxGainsLossesFromInvestmentsInEquityInstruments",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:EquityAttributableToOwnersOfParentMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag175": {
   "value": "105000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeNetOfTaxGainsLossesFromInvestmentsInEquityInstruments",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag208": {
   "value": "149000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossNetOfTax",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:OtherReservesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag226": {
   "value": "149000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossNetOfTax",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:EquityAttributableToOwnersOfParentMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag176": {
   "value": "149000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossNetOfTax",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag201": {
   "value": "2828000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeNetOfTaxExchangeDifferencesOnTranslation",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:ReserveOfExchangeDifferencesOnTranslationMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag227": {
   "value": "2828000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeNetOfTaxExchangeDifferencesOnTranslation",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:EquityAttributableToOwnersOfParentMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag177": {
   "value": "2828000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeNetOfTaxExchangeDifferencesOnTranslation",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag268": {
   "value": "-892000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeNetOfTaxCashFlowHedges",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:OtherReservesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag266": {
   "value": "-892000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeNetOfTaxCashFlowHedges",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:EquityAttributableToOwnersOfParentMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag264": {
   "value": "-892000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeNetOfTaxCashFlowHedges",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag267": {
   "value": "-34000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:ShareOfOtherComprehensiveIncomeLossOfEquityAccountedInvestmentsThatWillBeReclassifiedToProfitOrLossNetOfTax",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:OtherReservesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag265": {
   "value": "-34000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:ShareOfOtherComprehensiveIncomeLossOfEquityAccountedInvestmentsThatWillBeReclassifiedToProfitOrLossNetOfTax",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:EquityAttributableToOwnersOfParentMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag263": {
   "value": "-34000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:ShareOfOtherComprehensiveIncomeLossOfEquityAccountedInvestmentsThatWillBeReclassifiedToProfitOrLossNetOfTax",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag202": {
   "value": "2828000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossNetOfTax",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:ReserveOfExchangeDifferencesOnTranslationMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag262": {
   "value": "-926000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossNetOfTax",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:OtherReservesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag228": {
   "value": "1902000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossNetOfTax",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:EquityAttributableToOwnersOfParentMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag178": {
   "value": "1902000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossNetOfTax",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag203": {
   "value": "2828000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ComprehensiveIncome",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:ReserveOfExchangeDifferencesOnTranslationMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag261": {
   "value": "-777000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ComprehensiveIncome",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:OtherReservesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag217": {
   "value": "5821000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ComprehensiveIncome",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "eni:ProfitLossAttributableToOwnersOfParentMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag229": {
   "value": "7872000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ComprehensiveIncome",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:EquityAttributableToOwnersOfParentMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag240": {
   "value": "19000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ComprehensiveIncome",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:NoncontrollingInterestsMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag179": {
   "value": "7891000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ComprehensiveIncome",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag260": {
   "value": "-429000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:DividendsRecognisedAsDistributionsToOwnersOfParentRelatingToPriorYears",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "eni:RetainedEarningsExcludingProfitLossForReportingPeriodMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag218": {
   "value": "1286000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:DividendsRecognisedAsDistributionsToOwnersOfParentRelatingToPriorYears",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "eni:ProfitLossAttributableToOwnersOfParentMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag230": {
   "value": "857000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:DividendsRecognisedAsDistributionsToOwnersOfParentRelatingToPriorYears",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:EquityAttributableToOwnersOfParentMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag180": {
   "value": "857000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:DividendsRecognisedAsDistributionsToOwnersOfParentRelatingToPriorYears",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag192": {
   "value": "1533000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:DividendsRecognisedAsDistributionsToOwnersOfParentRelatingToCurrentYear",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "eni:RetainedEarningsExcludingProfitLossForReportingPeriodMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag231": {
   "value": "1533000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:DividendsRecognisedAsDistributionsToOwnersOfParentRelatingToCurrentYear",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:EquityAttributableToOwnersOfParentMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag181": {
   "value": "1533000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:DividendsRecognisedAsDistributionsToOwnersOfParentRelatingToCurrentYear",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag241": {
   "value": "5000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:DividendsRecognisedAsDistributionsToNoncontrollingInterests",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:NoncontrollingInterestsMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag182": {
   "value": "5000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:DividendsRecognisedAsDistributionsToNoncontrollingInterests",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag259": {
   "value": "-9921000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:IncreaseDecreaseThroughAppropriationOfRetainedEarnings",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "eni:RetainedEarningsExcludingProfitLossForReportingPeriodMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag219": {
   "value": "9921000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:IncreaseDecreaseThroughAppropriationOfRetainedEarnings",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "eni:ProfitLossAttributableToOwnersOfParentMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag193": {
   "value": "400000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:PurchaseOfTreasuryShares",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "eni:RetainedEarningsExcludingProfitLossForReportingPeriodMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag258": {
   "value": "-400000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:PurchaseOfTreasuryShares",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:OtherReservesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag214": {
   "value": "400000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:PurchaseOfTreasuryShares",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:TreasurySharesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag232": {
   "value": "400000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:PurchaseOfTreasuryShares",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:EquityAttributableToOwnersOfParentMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag183": {
   "value": "400000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:PurchaseOfTreasuryShares",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag194": {
   "value": "16000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:IncreaseDecreaseThroughSharebasedPaymentTransactions",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "eni:RetainedEarningsExcludingProfitLossForReportingPeriodMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag257": {
   "value": "-23000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:IncreaseDecreaseThroughSharebasedPaymentTransactions",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:OtherReservesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag215": {
   "value": "23000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:IncreaseDecreaseThroughSharebasedPaymentTransactions",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:TreasurySharesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag233": {
   "value": "16000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:IncreaseDecreaseThroughSharebasedPaymentTransactions",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:EquityAttributableToOwnersOfParentMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag184": {
   "value": "16000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:IncreaseDecreaseThroughSharebasedPaymentTransactions",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag256": {
   "value": "-11000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:IncreaseDecreaseThroughAcquisitionOfSubsidiary",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:NoncontrollingInterestsMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag255": {
   "value": "-11000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:IncreaseDecreaseThroughAcquisitionOfSubsidiary",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag209": {
   "value": "2000000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:IncreaseDecreaseThroughNetIssueReimbursementOfPerpetualSubordinatedBondsEquity",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:OtherReservesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag234": {
   "value": "2000000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:IncreaseDecreaseThroughNetIssueReimbursementOfPerpetualSubordinatedBondsEquity",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:EquityAttributableToOwnersOfParentMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag185": {
   "value": "2000000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:IncreaseDecreaseThroughNetIssueReimbursementOfPerpetualSubordinatedBondsEquity",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag195": {
   "value": "61000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:DecreaseThroughCouponPaymentOnPerpetualSubordinatedBondsEquity",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "eni:RetainedEarningsExcludingProfitLossForReportingPeriodMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag235": {
   "value": "61000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:DecreaseThroughCouponPaymentOnPerpetualSubordinatedBondsEquity",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:EquityAttributableToOwnersOfParentMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag186": {
   "value": "61000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:DecreaseThroughCouponPaymentOnPerpetualSubordinatedBondsEquity",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag254": {
   "value": "-11470000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:IncreaseDecreaseThroughTransactionsWithOwners",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "eni:RetainedEarningsExcludingProfitLossForReportingPeriodMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag210": {
   "value": "2377000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:IncreaseDecreaseThroughTransactionsWithOwners",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:OtherReservesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag253": {
   "value": "-377000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:IncreaseDecreaseThroughTransactionsWithOwners",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:TreasurySharesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag220": {
   "value": "8635000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:IncreaseDecreaseThroughTransactionsWithOwners",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "eni:ProfitLossAttributableToOwnersOfParentMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag252": {
   "value": "-835000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:IncreaseDecreaseThroughTransactionsWithOwners",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:EquityAttributableToOwnersOfParentMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag251": {
   "value": "-16000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:IncreaseDecreaseThroughTransactionsWithOwners",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:NoncontrollingInterestsMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag250": {
   "value": "-851000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:IncreaseDecreaseThroughTransactionsWithOwners",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag196": {
   "value": "15000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:CostsForIssueOfPerpetualSubordinatedBonds",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "eni:RetainedEarningsExcludingProfitLossForReportingPeriodMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag236": {
   "value": "15000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:CostsForIssueOfPerpetualSubordinatedBonds",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:EquityAttributableToOwnersOfParentMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag187": {
   "value": "15000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:CostsForIssueOfPerpetualSubordinatedBonds",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag197": {
   "value": "192000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:OtherChanges",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "eni:RetainedEarningsExcludingProfitLossForReportingPeriodMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag249": {
   "value": "-193000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:OtherChanges",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:ReserveOfExchangeDifferencesOnTranslationMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag211": {
   "value": "1000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:OtherChanges",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:OtherReservesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag242": {
   "value": "1000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:OtherChanges",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:NoncontrollingInterestsMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag188": {
   "value": "1000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:OtherChanges",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag198": {
   "value": "177000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:IncreaseDecreaseThroughTransfersAndOtherChangesEquity",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "eni:RetainedEarningsExcludingProfitLossForReportingPeriodMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag248": {
   "value": "-193000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:IncreaseDecreaseThroughTransfersAndOtherChangesEquity",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:ReserveOfExchangeDifferencesOnTranslationMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag212": {
   "value": "1000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:IncreaseDecreaseThroughTransfersAndOtherChangesEquity",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:OtherReservesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag245": {
   "value": "-15000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:IncreaseDecreaseThroughTransfersAndOtherChangesEquity",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:EquityAttributableToOwnersOfParentMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag243": {
   "value": "1000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:IncreaseDecreaseThroughTransfersAndOtherChangesEquity",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:NoncontrollingInterestsMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag247": {
   "value": "-14000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:IncreaseDecreaseThroughTransfersAndOtherChangesEquity",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag190": {
   "value": "4005000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:Equity",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:IssuedCapitalMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag199": {
   "value": "22750000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:Equity",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "eni:RetainedEarningsExcludingProfitLossForReportingPeriodMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag204": {
   "value": "6530000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:Equity",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:ReserveOfExchangeDifferencesOnTranslationMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag213": {
   "value": "6289000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:Equity",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:OtherReservesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag246": {
   "value": "-958000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:Equity",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:TreasurySharesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag221": {
   "value": "5821000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:Equity",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "eni:ProfitLossAttributableToOwnersOfParentMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag237": {
   "value": "44437000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:Equity",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:EquityAttributableToOwnersOfParentMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag244": {
   "value": "82000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:Equity",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:NoncontrollingInterestsMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag172": {
   "value": "44519000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:Equity",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag286": {
   "value": "4005000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:Equity",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:IssuedCapitalMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag288": {
   "value": "35894000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:Equity",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "eni:RetainedEarningsExcludingProfitLossForReportingPeriodMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag293": {
   "value": "7209000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:Equity",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:ReserveOfExchangeDifferencesOnTranslationMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag295": {
   "value": "1564000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:Equity",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:OtherReservesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag364": {
   "value": "-981000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:Equity",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:TreasurySharesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag308": {
   "value": "148000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:Equity",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "eni:ProfitLossAttributableToOwnersOfParentMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag311": {
   "value": "47839000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:Equity",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:EquityAttributableToOwnersOfParentMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag324": {
   "value": "61000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:Equity",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:NoncontrollingInterestsMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag271": {
   "value": "47900000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:Equity",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag363": {
   "value": "-8635000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ProfitLoss",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "eni:ProfitLossAttributableToOwnersOfParentMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag362": {
   "value": "-8635000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ProfitLoss",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:EquityAttributableToOwnersOfParentMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag325": {
   "value": "7000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ProfitLoss",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:NoncontrollingInterestsMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag361": {
   "value": "-8628000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ProfitLoss",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag296": {
   "value": "9000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeNetOfTaxGainsLossesOnRemeasurementsOfDefinedBenefitPlans",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:OtherReservesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag312": {
   "value": "9000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeNetOfTaxGainsLossesOnRemeasurementsOfDefinedBenefitPlans",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:EquityAttributableToOwnersOfParentMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag273": {
   "value": "9000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeNetOfTaxGainsLossesOnRemeasurementsOfDefinedBenefitPlans",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag297": {
   "value": "24000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeNetOfTaxGainsLossesFromInvestmentsInEquityInstruments",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:OtherReservesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag313": {
   "value": "24000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeNetOfTaxGainsLossesFromInvestmentsInEquityInstruments",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:EquityAttributableToOwnersOfParentMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag274": {
   "value": "24000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeNetOfTaxGainsLossesFromInvestmentsInEquityInstruments",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag298": {
   "value": "33000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossNetOfTax",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:OtherReservesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag314": {
   "value": "33000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossNetOfTax",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:EquityAttributableToOwnersOfParentMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag275": {
   "value": "33000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossNetOfTax",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag360": {
   "value": "-3313000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeNetOfTaxExchangeDifferencesOnTranslation",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:ReserveOfExchangeDifferencesOnTranslationMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag359": {
   "value": "-1000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeNetOfTaxExchangeDifferencesOnTranslation",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:OtherReservesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag358": {
   "value": "-3314000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeNetOfTaxExchangeDifferencesOnTranslation",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:EquityAttributableToOwnersOfParentMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag357": {
   "value": "-3314000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeNetOfTaxExchangeDifferencesOnTranslation",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag299": {
   "value": "469000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeNetOfTaxCashFlowHedges",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:OtherReservesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag315": {
   "value": "469000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeNetOfTaxCashFlowHedges",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:EquityAttributableToOwnersOfParentMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag276": {
   "value": "469000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeNetOfTaxCashFlowHedges",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag300": {
   "value": "32000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:ShareOfOtherComprehensiveIncomeLossOfEquityAccountedInvestmentsThatWillBeReclassifiedToProfitOrLossNetOfTax",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:OtherReservesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag316": {
   "value": "32000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:ShareOfOtherComprehensiveIncomeLossOfEquityAccountedInvestmentsThatWillBeReclassifiedToProfitOrLossNetOfTax",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:EquityAttributableToOwnersOfParentMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag277": {
   "value": "32000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:ShareOfOtherComprehensiveIncomeLossOfEquityAccountedInvestmentsThatWillBeReclassifiedToProfitOrLossNetOfTax",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag356": {
   "value": "-3313000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossNetOfTax",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:ReserveOfExchangeDifferencesOnTranslationMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag301": {
   "value": "500000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossNetOfTax",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:OtherReservesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag353": {
   "value": "-2813000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossNetOfTax",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:EquityAttributableToOwnersOfParentMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag351": {
   "value": "-2813000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossNetOfTax",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag355": {
   "value": "-3313000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ComprehensiveIncome",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:ReserveOfExchangeDifferencesOnTranslationMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag302": {
   "value": "533000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ComprehensiveIncome",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:OtherReservesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag352": {
   "value": "-8635000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ComprehensiveIncome",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "eni:ProfitLossAttributableToOwnersOfParentMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag354": {
   "value": "-11415000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ComprehensiveIncome",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:EquityAttributableToOwnersOfParentMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag326": {
   "value": "7000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ComprehensiveIncome",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:NoncontrollingInterestsMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag350": {
   "value": "-11408000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ComprehensiveIncome",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag349": {
   "value": "-1542000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:DividendsRecognisedAsDistributionsToOwnersOfParentRelatingToPriorYears",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "eni:RetainedEarningsExcludingProfitLossForReportingPeriodMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag309": {
   "value": "3078000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:DividendsRecognisedAsDistributionsToOwnersOfParentRelatingToPriorYears",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "eni:ProfitLossAttributableToOwnersOfParentMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag317": {
   "value": "1536000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:DividendsRecognisedAsDistributionsToOwnersOfParentRelatingToPriorYears",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:EquityAttributableToOwnersOfParentMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag278": {
   "value": "1536000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:DividendsRecognisedAsDistributionsToOwnersOfParentRelatingToPriorYears",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag289": {
   "value": "429000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:DividendsRecognisedAsDistributionsToOwnersOfParentRelatingToCurrentYear",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "eni:RetainedEarningsExcludingProfitLossForReportingPeriodMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag318": {
   "value": "429000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:DividendsRecognisedAsDistributionsToOwnersOfParentRelatingToCurrentYear",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:EquityAttributableToOwnersOfParentMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag279": {
   "value": "429000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:DividendsRecognisedAsDistributionsToOwnersOfParentRelatingToCurrentYear",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag327": {
   "value": "3000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:DividendsRecognisedAsDistributionsToNoncontrollingInterests",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:NoncontrollingInterestsMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag280": {
   "value": "3000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:DividendsRecognisedAsDistributionsToNoncontrollingInterests",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag348": {
   "value": "-2930000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:IncreaseDecreaseThroughAppropriationOfRetainedEarnings",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "eni:RetainedEarningsExcludingProfitLossForReportingPeriodMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag310": {
   "value": "2930000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:IncreaseDecreaseThroughAppropriationOfRetainedEarnings",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "eni:ProfitLossAttributableToOwnersOfParentMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag347": {
   "value": "-400000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CancellationOfTreasuryShares",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:OtherReservesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag306": {
   "value": "400000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CancellationOfTreasuryShares",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:TreasurySharesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag290": {
   "value": "7000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:IncreaseDecreaseThroughSharebasedPaymentTransactions",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "eni:RetainedEarningsExcludingProfitLossForReportingPeriodMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag319": {
   "value": "7000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:IncreaseDecreaseThroughSharebasedPaymentTransactions",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:EquityAttributableToOwnersOfParentMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag281": {
   "value": "7000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:IncreaseDecreaseThroughSharebasedPaymentTransactions",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag328": {
   "value": "15000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:IncreaseDecreaseThroughAcquisitionOfSubsidiary",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:NoncontrollingInterestsMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag282": {
   "value": "15000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:IncreaseDecreaseThroughAcquisitionOfSubsidiary",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag303": {
   "value": "3000000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:IncreaseDecreaseThroughNetIssueReimbursementOfPerpetualSubordinatedBondsEquity",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:OtherReservesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag320": {
   "value": "3000000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:IncreaseDecreaseThroughNetIssueReimbursementOfPerpetualSubordinatedBondsEquity",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:EquityAttributableToOwnersOfParentMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag283": {
   "value": "3000000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:IncreaseDecreaseThroughNetIssueReimbursementOfPerpetualSubordinatedBondsEquity",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag346": {
   "value": "-1810000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:IncreaseDecreaseThroughTransactionsWithOwners",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "eni:RetainedEarningsExcludingProfitLossForReportingPeriodMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag304": {
   "value": "2600000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:IncreaseDecreaseThroughTransactionsWithOwners",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:OtherReservesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag307": {
   "value": "400000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:IncreaseDecreaseThroughTransactionsWithOwners",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:TreasurySharesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag331": {
   "value": "-148000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:IncreaseDecreaseThroughTransactionsWithOwners",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "eni:ProfitLossAttributableToOwnersOfParentMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag321": {
   "value": "1042000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:IncreaseDecreaseThroughTransactionsWithOwners",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:EquityAttributableToOwnersOfParentMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag329": {
   "value": "12000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:IncreaseDecreaseThroughTransactionsWithOwners",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:NoncontrollingInterestsMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag284": {
   "value": "1054000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:IncreaseDecreaseThroughTransactionsWithOwners",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag291": {
   "value": "25000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:CostsForIssueOfPerpetualSubordinatedBonds",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "eni:RetainedEarningsExcludingProfitLossForReportingPeriodMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag322": {
   "value": "25000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:CostsForIssueOfPerpetualSubordinatedBonds",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:EquityAttributableToOwnersOfParentMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag285": {
   "value": "25000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:CostsForIssueOfPerpetualSubordinatedBonds",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag345": {
   "value": "-16000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:OtherChanges",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "eni:RetainedEarningsExcludingProfitLossForReportingPeriodMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag343": {
   "value": "-1000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:OtherChanges",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:ReserveOfExchangeDifferencesOnTranslationMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag341": {
   "value": "-9000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:OtherChanges",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:OtherReservesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag339": {
   "value": "-26000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:OtherChanges",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:EquityAttributableToOwnersOfParentMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag338": {
   "value": "-2000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:OtherChanges",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:NoncontrollingInterestsMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag337": {
   "value": "-28000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:OtherChanges",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag344": {
   "value": "-41000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:IncreaseDecreaseThroughTransfersAndOtherChangesEquity",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "eni:RetainedEarningsExcludingProfitLossForReportingPeriodMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag342": {
   "value": "-1000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:IncreaseDecreaseThroughTransfersAndOtherChangesEquity",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:ReserveOfExchangeDifferencesOnTranslationMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag340": {
   "value": "-9000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:IncreaseDecreaseThroughTransfersAndOtherChangesEquity",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:OtherReservesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag334": {
   "value": "-51000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:IncreaseDecreaseThroughTransfersAndOtherChangesEquity",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:EquityAttributableToOwnersOfParentMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag335": {
   "value": "-2000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:IncreaseDecreaseThroughTransfersAndOtherChangesEquity",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:NoncontrollingInterestsMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag336": {
   "value": "-53000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:IncreaseDecreaseThroughTransfersAndOtherChangesEquity",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag287": {
   "value": "4005000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:Equity",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:IssuedCapitalMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag292": {
   "value": "34043000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:Equity",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "eni:RetainedEarningsExcludingProfitLossForReportingPeriodMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag294": {
   "value": "3895000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:Equity",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:ReserveOfExchangeDifferencesOnTranslationMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag305": {
   "value": "4688000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:Equity",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:OtherReservesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag333": {
   "value": "-581000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:Equity",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:TreasurySharesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag332": {
   "value": "-8635000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:Equity",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "eni:ProfitLossAttributableToOwnersOfParentMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag323": {
   "value": "37415000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:Equity",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:EquityAttributableToOwnersOfParentMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag330": {
   "value": "78000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:Equity",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:NoncontrollingInterestsMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag272": {
   "value": "37493000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:Equity",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag367": {
   "value": "4005000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:Equity",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:IssuedCapitalMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag368": {
   "value": "35189000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:Equity",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "eni:RetainedEarningsExcludingProfitLossForReportingPeriodMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag369": {
   "value": "6605000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:Equity",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:ReserveOfExchangeDifferencesOnTranslationMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag370": {
   "value": "1672000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:Equity",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:OtherReservesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag403": {
   "value": "-581000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:Equity",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:TreasurySharesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag371": {
   "value": "4126000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:Equity",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "eni:ProfitLossAttributableToOwnersOfParentMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag377": {
   "value": "51016000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:Equity",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:EquityAttributableToOwnersOfParentMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag379": {
   "value": "57000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:Equity",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:NoncontrollingInterestsMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag365": {
   "value": "51073000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:Equity",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag401": {
   "value": "-4000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:IncreaseDecreaseDueToChangesInAccountingPoliciesWithoutRestatementOfPriorPeriodData",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "eni:RetainedEarningsExcludingProfitLossForReportingPeriodMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag400": {
   "value": "-4000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:IncreaseDecreaseDueToChangesInAccountingPoliciesWithoutRestatementOfPriorPeriodData",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:EquityAttributableToOwnersOfParentMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag399": {
   "value": "-4000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:IncreaseDecreaseDueToChangesInAccountingPoliciesWithoutRestatementOfPriorPeriodData",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag372": {
   "value": "4005000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:EquityAdjustedValue",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:IssuedCapitalMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag373": {
   "value": "35185000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:EquityAdjustedValue",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "eni:RetainedEarningsExcludingProfitLossForReportingPeriodMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag374": {
   "value": "6605000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:EquityAdjustedValue",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:ReserveOfExchangeDifferencesOnTranslationMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag375": {
   "value": "1672000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:EquityAdjustedValue",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:OtherReservesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag402": {
   "value": "-581000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:EquityAdjustedValue",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:TreasurySharesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag376": {
   "value": "4126000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:EquityAdjustedValue",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "eni:ProfitLossAttributableToOwnersOfParentMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag378": {
   "value": "51012000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:EquityAdjustedValue",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:EquityAttributableToOwnersOfParentMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag380": {
   "value": "57000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:EquityAdjustedValue",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:NoncontrollingInterestsMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag366": {
   "value": "51069000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:EquityAdjustedValue",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag434": {
   "value": "148000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ProfitLoss",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "eni:ProfitLossAttributableToOwnersOfParentMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag439": {
   "value": "148000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ProfitLoss",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:EquityAttributableToOwnersOfParentMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag454": {
   "value": "7000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ProfitLoss",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:NoncontrollingInterestsMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag381": {
   "value": "155000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ProfitLoss",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag422": {
   "value": "-37000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeNetOfTaxGainsLossesOnRemeasurementsOfDefinedBenefitPlans",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:OtherReservesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag440": {
   "value": "-37000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeNetOfTaxGainsLossesOnRemeasurementsOfDefinedBenefitPlans",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:EquityAttributableToOwnersOfParentMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag408": {
   "value": "-37000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeNetOfTaxGainsLossesOnRemeasurementsOfDefinedBenefitPlans",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag464": {
   "value": "-7000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:ShareOfOtherComprehensiveIncomeLossOfEquityAccountedInvestmentsThatWillNotBeReclassifiedToProfitOrLossNetOfTax",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:OtherReservesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag465": {
   "value": "-7000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:ShareOfOtherComprehensiveIncomeLossOfEquityAccountedInvestmentsThatWillNotBeReclassifiedToProfitOrLossNetOfTax",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:EquityAttributableToOwnersOfParentMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag463": {
   "value": "-7000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:ShareOfOtherComprehensiveIncomeLossOfEquityAccountedInvestmentsThatWillNotBeReclassifiedToProfitOrLossNetOfTax",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag423": {
   "value": "-3000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeNetOfTaxGainsLossesFromInvestmentsInEquityInstruments",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:OtherReservesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag441": {
   "value": "-3000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeNetOfTaxGainsLossesFromInvestmentsInEquityInstruments",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:EquityAttributableToOwnersOfParentMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag407": {
   "value": "-3000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeNetOfTaxGainsLossesFromInvestmentsInEquityInstruments",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag424": {
   "value": "-47000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossNetOfTax",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:OtherReservesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag442": {
   "value": "-47000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossNetOfTax",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:EquityAttributableToOwnersOfParentMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag406": {
   "value": "-47000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossNetOfTax",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag419": {
   "value": "604000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeNetOfTaxExchangeDifferencesOnTranslation",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:ReserveOfExchangeDifferencesOnTranslationMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag443": {
   "value": "604000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeNetOfTaxExchangeDifferencesOnTranslation",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:EquityAttributableToOwnersOfParentMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag382": {
   "value": "604000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeNetOfTaxExchangeDifferencesOnTranslation",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag425": {
   "value": "-482000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeNetOfTaxCashFlowHedges",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:OtherReservesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag444": {
   "value": "-482000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeNetOfTaxCashFlowHedges",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:EquityAttributableToOwnersOfParentMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag404": {
   "value": "-482000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeNetOfTaxCashFlowHedges",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag426": {
   "value": "-6000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:ShareOfOtherComprehensiveIncomeLossOfEquityAccountedInvestmentsThatWillBeReclassifiedToProfitOrLossNetOfTax",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:OtherReservesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag445": {
   "value": "-6000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:ShareOfOtherComprehensiveIncomeLossOfEquityAccountedInvestmentsThatWillBeReclassifiedToProfitOrLossNetOfTax",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:EquityAttributableToOwnersOfParentMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag405": {
   "value": "-6000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:ShareOfOtherComprehensiveIncomeLossOfEquityAccountedInvestmentsThatWillBeReclassifiedToProfitOrLossNetOfTax",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag420": {
   "value": "604000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossNetOfTax",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:ReserveOfExchangeDifferencesOnTranslationMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag427": {
   "value": "-488000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossNetOfTax",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:OtherReservesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag446": {
   "value": "116000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossNetOfTax",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:EquityAttributableToOwnersOfParentMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag383": {
   "value": "116000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossNetOfTax",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag421": {
   "value": "604000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ComprehensiveIncome",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:ReserveOfExchangeDifferencesOnTranslationMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag428": {
   "value": "-535000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ComprehensiveIncome",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:OtherReservesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag435": {
   "value": "148000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ComprehensiveIncome",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "eni:ProfitLossAttributableToOwnersOfParentMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag447": {
   "value": "217000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ComprehensiveIncome",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:EquityAttributableToOwnersOfParentMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag455": {
   "value": "7000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ComprehensiveIncome",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:NoncontrollingInterestsMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag384": {
   "value": "224000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ComprehensiveIncome",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag412": {
   "value": "-1513000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:DividendsRecognisedAsDistributionsToOwnersOfParentRelatingToPriorYears",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "eni:RetainedEarningsExcludingProfitLossForReportingPeriodMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag436": {
   "value": "2989000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:DividendsRecognisedAsDistributionsToOwnersOfParentRelatingToPriorYears",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "eni:ProfitLossAttributableToOwnersOfParentMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag448": {
   "value": "1476000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:DividendsRecognisedAsDistributionsToOwnersOfParentRelatingToPriorYears",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:EquityAttributableToOwnersOfParentMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag393": {
   "value": "1476000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:DividendsRecognisedAsDistributionsToOwnersOfParentRelatingToPriorYears",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag413": {
   "value": "1542000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:DividendsRecognisedAsDistributionsToOwnersOfParentRelatingToCurrentYear",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "eni:RetainedEarningsExcludingProfitLossForReportingPeriodMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag449": {
   "value": "1542000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:DividendsRecognisedAsDistributionsToOwnersOfParentRelatingToCurrentYear",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:EquityAttributableToOwnersOfParentMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag394": {
   "value": "1542000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:DividendsRecognisedAsDistributionsToOwnersOfParentRelatingToCurrentYear",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag456": {
   "value": "4000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:DividendsRecognisedAsDistributionsToNoncontrollingInterests",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:NoncontrollingInterestsMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag395": {
   "value": "4000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:DividendsRecognisedAsDistributionsToNoncontrollingInterests",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag457": {
   "value": "-1000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:PaymentsAndReimbursementsByToMinorityShareholders",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:NoncontrollingInterestsMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag409": {
   "value": "-1000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:PaymentsAndReimbursementsByToMinorityShareholders",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag414": {
   "value": "1137000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:IncreaseDecreaseThroughAppropriationOfRetainedEarnings",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "eni:RetainedEarningsExcludingProfitLossForReportingPeriodMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag437": {
   "value": "-1137000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:IncreaseDecreaseThroughAppropriationOfRetainedEarnings",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "eni:ProfitLossAttributableToOwnersOfParentMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag415": {
   "value": "400000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:PurchaseOfTreasuryShares",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "eni:RetainedEarningsExcludingProfitLossForReportingPeriodMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag429": {
   "value": "-400000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:PurchaseOfTreasuryShares",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:OtherReservesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag432": {
   "value": "400000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:PurchaseOfTreasuryShares",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:TreasurySharesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag450": {
   "value": "400000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:PurchaseOfTreasuryShares",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:EquityAttributableToOwnersOfParentMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag396": {
   "value": "400000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:PurchaseOfTreasuryShares",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag416": {
   "value": "9000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:IncreaseDecreaseThroughSharebasedPaymentTransactions",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "eni:RetainedEarningsExcludingProfitLossForReportingPeriodMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag451": {
   "value": "9000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:IncreaseDecreaseThroughSharebasedPaymentTransactions",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:EquityAttributableToOwnersOfParentMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag397": {
   "value": "9000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:IncreaseDecreaseThroughSharebasedPaymentTransactions",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag417": {
   "value": "717000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:IncreaseDecreaseThroughTransactionsWithOwners",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "eni:RetainedEarningsExcludingProfitLossForReportingPeriodMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag430": {
   "value": "400000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:IncreaseDecreaseThroughTransactionsWithOwners",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:OtherReservesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag433": {
   "value": "-400000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:IncreaseDecreaseThroughTransactionsWithOwners",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:TreasurySharesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag438": {
   "value": "-4126000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:IncreaseDecreaseThroughTransactionsWithOwners",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "eni:ProfitLossAttributableToOwnersOfParentMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag452": {
   "value": "-3409000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:IncreaseDecreaseThroughTransactionsWithOwners",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:EquityAttributableToOwnersOfParentMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag458": {
   "value": "-5000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:IncreaseDecreaseThroughTransactionsWithOwners",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:NoncontrollingInterestsMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag411": {
   "value": "-3414000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:IncreaseDecreaseThroughTransactionsWithOwners",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag418": {
   "value": "-8000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:IncreaseDecreaseThroughTransfersAndOtherChangesEquity",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "eni:RetainedEarningsExcludingProfitLossForReportingPeriodMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag431": {
   "value": "27000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:IncreaseDecreaseThroughTransfersAndOtherChangesEquity",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:OtherReservesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag453": {
   "value": "19000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:IncreaseDecreaseThroughTransfersAndOtherChangesEquity",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:EquityAttributableToOwnersOfParentMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag459": {
   "value": "2000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:IncreaseDecreaseThroughTransfersAndOtherChangesEquity",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:NoncontrollingInterestsMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag398": {
   "value": "21000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:IncreaseDecreaseThroughTransfersAndOtherChangesEquity",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag386": {
   "value": "4005000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:Equity",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:IssuedCapitalMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag387": {
   "value": "35894000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:Equity",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "eni:RetainedEarningsExcludingProfitLossForReportingPeriodMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag388": {
   "value": "7209000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:Equity",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:ReserveOfExchangeDifferencesOnTranslationMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag389": {
   "value": "1564000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:Equity",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:OtherReservesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag410": {
   "value": "-981000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:Equity",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:TreasurySharesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag390": {
   "value": "148000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:Equity",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "eni:ProfitLossAttributableToOwnersOfParentMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag391": {
   "value": "47839000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:Equity",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:EquityAttributableToOwnersOfParentMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag392": {
   "value": "61000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:Equity",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:NoncontrollingInterestsMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag385": {
   "value": "47900000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:Equity",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag568": {
   "value": "5840000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ProfitLoss",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag729": {
   "value": "-8628000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ProfitLoss",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag601": {
   "value": "155000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ProfitLoss",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag569": {
   "value": "7063000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:AdjustmentsForDepreciationAndAmortisationExpense",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag584": {
   "value": "7304000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:AdjustmentsForDepreciationAndAmortisationExpense",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag602": {
   "value": "8106000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:AdjustmentsForDepreciationAndAmortisationExpense",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag570": {
   "value": "167000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:AdjustmentsForImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLoss",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag585": {
   "value": "3183000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:AdjustmentsForImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLoss",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag603": {
   "value": "2188000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:AdjustmentsForImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLoss",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag571": {
   "value": "387000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:WriteOffOfTangibleOrIntangibleAssets",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag586": {
   "value": "329000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:WriteOffOfTangibleOrIntangibleAssets",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag604": {
   "value": "300000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:WriteOffOfTangibleOrIntangibleAssets",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag728": {
   "value": "-1091000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:AdjustmentsForUndistributedProfitsOfInvestmentsAccountedForUsingEquityMethod",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag726": {
   "value": "-1733000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:AdjustmentsForUndistributedProfitsOfInvestmentsAccountedForUsingEquityMethod",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag724": {
   "value": "-88000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:AdjustmentsForUndistributedProfitsOfInvestmentsAccountedForUsingEquityMethod",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag727": {
   "value": "-102000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:AdjustmentsForLossesGainsOnDisposalOfNoncurrentAssets",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag725": {
   "value": "-9000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:AdjustmentsForLossesGainsOnDisposalOfNoncurrentAssets",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag723": {
   "value": "-170000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:AdjustmentsForLossesGainsOnDisposalOfNoncurrentAssets",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag572": {
   "value": "230000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:AdjustmentsForDividendIncome",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag587": {
   "value": "150000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:AdjustmentsForDividendIncome",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag605": {
   "value": "247000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:AdjustmentsForDividendIncome",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag573": {
   "value": "75000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:AdjustmentsForInterestIncome",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag588": {
   "value": "126000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:AdjustmentsForInterestIncome",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag606": {
   "value": "147000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:AdjustmentsForInterestIncome",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag574": {
   "value": "794000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:AdjustmentsForInterestExpense",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag589": {
   "value": "877000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:AdjustmentsForInterestExpense",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag607": {
   "value": "1027000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:AdjustmentsForInterestExpense",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag575": {
   "value": "4845000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:AdjustmentsForIncomeTaxExpense",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag590": {
   "value": "2650000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:AdjustmentsForIncomeTaxExpense",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag608": {
   "value": "5591000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:AdjustmentsForIncomeTaxExpense",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag719": {
   "value": "-194000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherAdjustmentsToReconcileProfitLoss",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag591": {
   "value": "92000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherAdjustmentsToReconcileProfitLoss",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag722": {
   "value": "-179000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherAdjustmentsToReconcileProfitLoss",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag576": {
   "value": "3146000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:IncreaseDecreaseInWorkingCapital",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag592": {
   "value": "18000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:IncreaseDecreaseInWorkingCapital",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag721": {
   "value": "-366000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:IncreaseDecreaseInWorkingCapital",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag718": {
   "value": "-2033000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:AdjustmentsForDecreaseIncreaseInInventories",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag593": {
   "value": "1054000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:AdjustmentsForDecreaseIncreaseInInventories",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag720": {
   "value": "-200000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:AdjustmentsForDecreaseIncreaseInInventories",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag717": {
   "value": "-7888000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:AdjustmentsForDecreaseIncreaseInTradeAccountReceivable",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag594": {
   "value": "1316000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:AdjustmentsForDecreaseIncreaseInTradeAccountReceivable",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag609": {
   "value": "1023000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:AdjustmentsForDecreaseIncreaseInTradeAccountReceivable",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag577": {
   "value": "7744000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:AdjustmentsForIncreaseDecreaseInTradeAccountPayable",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag714": {
   "value": "-1614000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:AdjustmentsForIncreaseDecreaseInTradeAccountPayable",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag713": {
   "value": "-940000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:AdjustmentsForIncreaseDecreaseInTradeAccountPayable",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag716": {
   "value": "-406000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:AdjustmentsForProvisions",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag715": {
   "value": "-1056000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:AdjustmentsForProvisions",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag610": {
   "value": "272000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:AdjustmentsForProvisions",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag712": {
   "value": "-563000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:AdjustmentsForIncreaseDecreaseInOtherAssetsAndLiabilities",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag595": {
   "value": "282000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:AdjustmentsForIncreaseDecreaseInOtherAssetsAndLiabilities",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag611": {
   "value": "211000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:AdjustmentsForIncreaseDecreaseInOtherAssetsAndLiabilities",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag578": {
   "value": "54000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:AdjustmentsForIncreaseDecreaseInEmployeeBenefitLiabilities",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag732": {
   "value": "-23000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:AdjustmentsForIncreaseDecreaseInEmployeeBenefitLiabilities",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag579": {
   "value": "857000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:DividendsReceivedClassifiedAsOperatingActivities",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag596": {
   "value": "509000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:DividendsReceivedClassifiedAsOperatingActivities",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag612": {
   "value": "1346000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:DividendsReceivedClassifiedAsOperatingActivities",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag580": {
   "value": "28000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:InterestReceivedClassifiedAsOperatingActivities",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag597": {
   "value": "53000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:InterestReceivedClassifiedAsOperatingActivities",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag613": {
   "value": "88000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:InterestReceivedClassifiedAsOperatingActivities",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag581": {
   "value": "792000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:InterestPaidClassifiedAsOperatingActivities",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag598": {
   "value": "928000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:InterestPaidClassifiedAsOperatingActivities",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag614": {
   "value": "1029000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:InterestPaidClassifiedAsOperatingActivities",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag582": {
   "value": "3726000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:IncomeTaxesPaidRefundClassifiedAsOperatingActivities",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag599": {
   "value": "2049000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:IncomeTaxesPaidRefundClassifiedAsOperatingActivities",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag615": {
   "value": "5068000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:IncomeTaxesPaidRefundClassifiedAsOperatingActivities",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag583": {
   "value": "12861000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CashFlowsFromUsedInOperatingActivities",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag600": {
   "value": "4822000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CashFlowsFromUsedInOperatingActivities",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag616": {
   "value": "12392000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CashFlowsFromUsedInOperatingActivities",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag709": {
   "value": "-4331000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CashFlowsFromUsedInOperatingActivities",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:CategoriesOfRelatedPartiesAxis": "ifrs-full:RelatedPartiesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag708": {
   "value": "-4640000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CashFlowsFromUsedInOperatingActivities",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:CategoriesOfRelatedPartiesAxis": "ifrs-full:RelatedPartiesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag707": {
   "value": "-6356000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CashFlowsFromUsedInOperatingActivities",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "ifrs-full:CategoriesOfRelatedPartiesAxis": "ifrs-full:RelatedPartiesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag617": {
   "value": "7815000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OutflowsOfCashFromInvestingActivities",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag632": {
   "value": "5959000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OutflowsOfCashFromInvestingActivities",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag644": {
   "value": "11928000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OutflowsOfCashFromInvestingActivities",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag618": {
   "value": "4950000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag633": {
   "value": "4407000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag645": {
   "value": "8049000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag619": {
   "value": "2000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:RightOfUseAssetsClassifiedAsInvestingActivities",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag646": {
   "value": "16000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:RightOfUseAssetsClassifiedAsInvestingActivities",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag620": {
   "value": "284000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:PurchaseOfIntangibleAssetsClassifiedAsInvestingActivities",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag634": {
   "value": "237000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:PurchaseOfIntangibleAssetsClassifiedAsInvestingActivities",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag647": {
   "value": "311000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:PurchaseOfIntangibleAssetsClassifiedAsInvestingActivities",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag621": {
   "value": "1901000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CashFlowsUsedInObtainingControlOfSubsidiariesOrOtherBusinessesClassifiedAsInvestingActivities",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag635": {
   "value": "109000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CashFlowsUsedInObtainingControlOfSubsidiariesOrOtherBusinessesClassifiedAsInvestingActivities",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag648": {
   "value": "5000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CashFlowsUsedInObtainingControlOfSubsidiariesOrOtherBusinessesClassifiedAsInvestingActivities",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag622": {
   "value": "837000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:PurchaseOfInvestments",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag636": {
   "value": "283000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:PurchaseOfInvestments",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag649": {
   "value": "3003000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:PurchaseOfInvestments",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag623": {
   "value": "227000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:CashOutflowsForSecuritiesAndFinancingReceivablesHeldForOperatingPurposesClassifiedAsInvestingActivities",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag637": {
   "value": "166000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:CashOutflowsForSecuritiesAndFinancingReceivablesHeldForOperatingPurposesClassifiedAsInvestingActivities",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag650": {
   "value": "237000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:CashOutflowsForSecuritiesAndFinancingReceivablesHeldForOperatingPurposesClassifiedAsInvestingActivities",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag624": {
   "value": "386000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:ChangesInPayablesInRelationToInvestingActivities",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag711": {
   "value": "-757000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:ChangesInPayablesInRelationToInvestingActivities",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag710": {
   "value": "-307000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:ChangesInPayablesInRelationToInvestingActivities",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag625": {
   "value": "536000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:InflowsOfCashFromInvestingActivities",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag638": {
   "value": "216000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:InflowsOfCashFromInvestingActivities",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag651": {
   "value": "794000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:InflowsOfCashFromInvestingActivities",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag626": {
   "value": "207000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ProceedsFromSalesOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag639": {
   "value": "12000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ProceedsFromSalesOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag652": {
   "value": "264000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ProceedsFromSalesOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag627": {
   "value": "1000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ProceedsFromSalesOfIntangibleAssetsClassifiedAsInvestingActivities",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag653": {
   "value": "17000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ProceedsFromSalesOfIntangibleAssetsClassifiedAsInvestingActivities",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag628": {
   "value": "76000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CashFlowsFromLosingControlOfSubsidiariesOrOtherBusinessesClassifiedAsInvestingActivities",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag654": {
   "value": "187000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CashFlowsFromLosingControlOfSubsidiariesOrOtherBusinessesClassifiedAsInvestingActivities",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag629": {
   "value": "35000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:IncomeTaxesPaidRefundClassifiedAsInvestingActivities",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag655": {
   "value": "3000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:IncomeTaxesPaidRefundClassifiedAsInvestingActivities",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag630": {
   "value": "155000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:ProceedsFromSalesOfInvestments",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag640": {
   "value": "16000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:ProceedsFromSalesOfInvestments",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag656": {
   "value": "39000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:ProceedsFromSalesOfInvestments",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag631": {
   "value": "141000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:CashInflowForSecuritiesAndFinancingReceivablesHeldForOperatingPurposesClassifiedAsInvestingActivities",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag641": {
   "value": "136000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:CashInflowForSecuritiesAndFinancingReceivablesHeldForOperatingPurposesClassifiedAsInvestingActivities",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag657": {
   "value": "195000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:CashInflowForSecuritiesAndFinancingReceivablesHeldForOperatingPurposesClassifiedAsInvestingActivities",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag706": {
   "value": "-9000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:ChangesInReceivablesInRelationToDisposals",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag642": {
   "value": "52000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:ChangesInReceivablesInRelationToDisposals",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag658": {
   "value": "95000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:ChangesInReceivablesInRelationToDisposals",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag705": {
   "value": "-4743000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:ChangesInSecuritiesAndFinancingReceivablesHeldForNonOperatingPurposesClassifiedAsInvestingActivities",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag643": {
   "value": "1156000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:ChangesInSecuritiesAndFinancingReceivablesHeldForNonOperatingPurposesClassifiedAsInvestingActivities",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag730": {
   "value": "-279000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:ChangesInSecuritiesAndFinancingReceivablesHeldForNonOperatingPurposesClassifiedAsInvestingActivities",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag704": {
   "value": "-12022000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CashFlowsFromUsedInInvestingActivities",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag702": {
   "value": "-4587000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CashFlowsFromUsedInInvestingActivities",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag700": {
   "value": "-11413000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CashFlowsFromUsedInInvestingActivities",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag703": {
   "value": "-976000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CashFlowsFromUsedInInvestingActivities",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:CategoriesOfRelatedPartiesAxis": "ifrs-full:RelatedPartiesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag701": {
   "value": "-1372000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CashFlowsFromUsedInInvestingActivities",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:CategoriesOfRelatedPartiesAxis": "ifrs-full:RelatedPartiesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag699": {
   "value": "-2912000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CashFlowsFromUsedInInvestingActivities",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "ifrs-full:CategoriesOfRelatedPartiesAxis": "ifrs-full:RelatedPartiesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag659": {
   "value": "3556000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ProceedsFromNoncurrentBorrowings",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag670": {
   "value": "5278000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ProceedsFromNoncurrentBorrowings",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag679": {
   "value": "1811000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ProceedsFromNoncurrentBorrowings",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag660": {
   "value": "2890000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:RepaymentsOfNoncurrentBorrowings",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag671": {
   "value": "3100000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:RepaymentsOfNoncurrentBorrowings",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag680": {
   "value": "3512000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:RepaymentsOfNoncurrentBorrowings",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag661": {
   "value": "939000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:PaymentsOfLeaseLiabilitiesClassifiedAsFinancingActivities",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag672": {
   "value": "869000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:PaymentsOfLeaseLiabilitiesClassifiedAsFinancingActivities",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag681": {
   "value": "877000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:PaymentsOfLeaseLiabilitiesClassifiedAsFinancingActivities",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag697": {
   "value": "-910000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CashFlowsFromUsedInIncreaseDecreaseInCurrentBorrowings",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag673": {
   "value": "937000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CashFlowsFromUsedInIncreaseDecreaseInCurrentBorrowings",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag682": {
   "value": "161000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CashFlowsFromUsedInIncreaseDecreaseInCurrentBorrowings",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag662": {
   "value": "2358000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:DividendsPaidToEquityHoldersOfParentClassifiedAsFinancingActivities",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag674": {
   "value": "1965000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:DividendsPaidToEquityHoldersOfParentClassifiedAsFinancingActivities",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag683": {
   "value": "3018000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:DividendsPaidToEquityHoldersOfParentClassifiedAsFinancingActivities",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag663": {
   "value": "5000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:DividendsPaidToNoncontrollingInterestsClassifiedAsFinancingActivities",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag675": {
   "value": "3000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:DividendsPaidToNoncontrollingInterestsClassifiedAsFinancingActivities",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag684": {
   "value": "4000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:DividendsPaidToNoncontrollingInterestsClassifiedAsFinancingActivities",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag685": {
   "value": "1000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:PaymentsForReimbursementsToNonControllingInterestClassifiedAsFinancingActivities",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag664": {
   "value": "17000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:PaymentsFromChangesInOwnershipInterestsInSubsidiaries",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag686": {
   "value": "1000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:PaymentsFromChangesInOwnershipInterestsInSubsidiaries",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag665": {
   "value": "400000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:PaymentsToAcquireOrRedeemEntitysShares",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag687": {
   "value": "400000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:PaymentsToAcquireOrRedeemEntitysShares",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag666": {
   "value": "1985000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ProceedsFromIssuingOtherEquityInstruments",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag676": {
   "value": "2975000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ProceedsFromIssuingOtherEquityInstruments",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag667": {
   "value": "61000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:PaymentsOfOtherEquityInstruments",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag696": {
   "value": "-2039000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CashFlowsFromUsedInFinancingActivities",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag677": {
   "value": "3253000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CashFlowsFromUsedInFinancingActivities",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag694": {
   "value": "-5841000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CashFlowsFromUsedInFinancingActivities",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag695": {
   "value": "-13000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CashFlowsFromUsedInFinancingActivities",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:CategoriesOfRelatedPartiesAxis": "ifrs-full:RelatedPartiesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag669": {
   "value": "164000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CashFlowsFromUsedInFinancingActivities",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:CategoriesOfRelatedPartiesAxis": "ifrs-full:RelatedPartiesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag731": {
   "value": "-817000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CashFlowsFromUsedInFinancingActivities",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "ifrs-full:CategoriesOfRelatedPartiesAxis": "ifrs-full:RelatedPartiesMember",
    "unit": "iso4217:EUR"
   }
  },
  "Tag668": {
   "value": "52000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:EffectOfExchangeRateChangesAndOtherChangesOnCashAndCashEquivalents",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag698": {
   "value": "-69000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:EffectOfExchangeRateChangesAndOtherChangesOnCashAndCashEquivalents",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag688": {
   "value": "1000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:EffectOfExchangeRateChangesAndOtherChangesOnCashAndCashEquivalents",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag693": {
   "value": "-1148000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:IncreaseDecreaseInCashAndCashEquivalents",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag678": {
   "value": "3419000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:IncreaseDecreaseInCashAndCashEquivalents",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag692": {
   "value": "-4861000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:IncreaseDecreaseInCashAndCashEquivalents",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00/2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag689": {
   "value": "9413000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CashAndCashEquivalentsIfDifferentFromStatementOfFinancialPosition",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag690": {
   "value": "5994000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CashAndCashEquivalentsIfDifferentFromStatementOfFinancialPosition",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag691": {
   "value": "10855000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CashAndCashEquivalentsIfDifferentFromStatementOfFinancialPosition",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2019-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag733": {
   "value": "8265000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CashAndCashEquivalentsIfDifferentFromStatementOfFinancialPosition",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   },
   "links": {
    "ftTyp_fact-footnote": {
     "ftGrp_default": [
      "footnote1"
     ]
    }
   }
  },
  "Tag734": {
   "value": "9413000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CashAndCashEquivalentsIfDifferentFromStatementOfFinancialPosition",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:EUR"
   },
   "links": {
    "ftTyp_fact-footnote": {
     "ftGrp_default": [
      "footnote1"
     ]
    }
   }
  },
  "Tag735": {
   "value": "5994000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CashAndCashEquivalentsIfDifferentFromStatementOfFinancialPosition",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2020-01-01T00:00:00",
    "unit": "iso4217:EUR"
   },
   "links": {
    "ftTyp_fact-footnote": {
     "ftGrp_default": [
      "footnote1"
     ]
    }
   }
  },
  "Tag736": {
   "value": "11000000",
   "decimals": -6,
   "dimensions": {
    "concept": "eni:CashAndCashEquivalentsInConsolidatedEntitiesHeldForSale",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:EUR"
   }
  },
  "Tag737": {
   "value": "Eni SpA",
   "dimensions": {
    "concept": "ifrs-full:NameOfReportingEntityOrOtherMeansOfIdentification",
    "language": "it",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00"
   }
  },
  "Tag1": {
   "value": "petrolio e/ogas naturale",
   "dimensions": {
    "concept": "ifrs-full:DescriptionOfNatureOfEntitysOperationsAndPrincipalActivities",
    "language": "it",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00"
   }
  },
  "Tag2": {
   "value": "Italia",
   "dimensions": {
    "concept": "ifrs-full:DomicileOfEntity",
    "language": "it",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00"
   }
  },
  "Tag3": {
   "value": "SpA",
   "dimensions": {
    "concept": "ifrs-full:LegalFormOfEntity",
    "language": "it",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00"
   }
  },
  "Tag4": {
   "value": "Eni SpA",
   "dimensions": {
    "concept": "ifrs-full:NameOfParentEntity",
    "language": "it",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00"
   }
  },
  "Tag5": {
   "value": "Piazzale Enrico Mattei, 1 - Roma - Italia",
   "dimensions": {
    "concept": "ifrs-full:AddressOfRegisteredOfficeOfEntity",
    "language": "it",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00"
   }
  },
  "Tag6": {
   "value": "Italia",
   "dimensions": {
    "concept": "ifrs-full:CountryOfIncorporation",
    "language": "it",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00"
   }
  },
  "Tag7": {
   "value": "Italia",
   "dimensions": {
    "concept": "ifrs-full:PrincipalPlaceOfBusiness",
    "language": "it",
    "entity": "scheme:BUCRF72VH5RBN7X3VL35",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00"
   }
  },
  "footnote1": {
   "value": "<span>Le disponibilit\u00e0 liquide ed equivalenti al 31 dicembre 2021 comprendono \u20ac11 milioni di disponibilit\u00e0 liquide ed equivalenti di societ\u00e0 consolidate destinate alla vendita che nello schema di stato</span><br/><span>patrimoniale sono riportate nella voce \u201cAttivit\u00e0 destinate alla vendita\u201d.</span>",
   "dimensions": {
    "concept": "xbrl:note",
    "noteId": "footnote1",
    "language": "it"
   }
  }
 }
}