{
 "documentInfo": {
  "documentType": "https://xbrl.org/2021/xbrl-json",
  "features": {
   "xbrl:canonicalValues": true
  },
  "namespaces": {
   "centrica": "http://centrica.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"
  },
  "taxonomy": [
   "http://centrica.com/xbrl/2021/e26edv109x6eepbkvh76-2021-12-31.xsd"
  ]
 },
 "facts": {
  "fact-1": {
   "value": "At Centrica, we have been at the forefront of supporting homes, businesses and communities with their energy needs for more than 200 years. We remain focused on giving customers what they want and need through our purpose of helping our customers live sustainably, simply and affordably.  At the heart of this, is our talented team of 20,000 colleagues including 7,000 engineers, who serve millions of customers every day through trusted brands like British Gas, Bord G\u00e1is Energy and Centrica Business Solutions. And central to it, is our commitment to provide responsible energy our customers can rely on. Alongside this, we\u2019re investing in our communities and creating the diverse and inclusive team we need for a greener future.In doing so, we can add value for all of our stakeholders. ",
   "dimensions": {
    "concept": "ifrs-full:DescriptionOfNatureOfEntitysOperationsAndPrincipalActivities",
    "language": "en",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00"
   }
  },
  "fact-6": {
   "value": "18300000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:Revenue",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "centrica:GroupIncomeStatementAxis": "centrica:BusinessPerformanceMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-7": {
   "value": "-3556000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:Revenue",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "centrica:GroupIncomeStatementAxis": "centrica:ExceptionalItemsAndCertainReMeasurementsMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-8": {
   "value": "14744000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:Revenue",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-9": {
   "value": "14949000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:Revenue",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "centrica:GroupIncomeStatementAxis": "centrica:BusinessPerformanceMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-10": {
   "value": "-2700000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:Revenue",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "centrica:GroupIncomeStatementAxis": "centrica:ExceptionalItemsAndCertainReMeasurementsMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-11": {
   "value": "12249000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:Revenue",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-12": {
   "value": "15430000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CostOfSales",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "centrica:GroupIncomeStatementAxis": "centrica:BusinessPerformanceMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-13": {
   "value": "-2749000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CostOfSales",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "centrica:GroupIncomeStatementAxis": "centrica:ExceptionalItemsAndCertainReMeasurementsMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-14": {
   "value": "12681000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CostOfSales",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-15": {
   "value": "12616000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CostOfSales",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "centrica:GroupIncomeStatementAxis": "centrica:BusinessPerformanceMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-16": {
   "value": "-4118000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CostOfSales",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "centrica:GroupIncomeStatementAxis": "centrica:ExceptionalItemsAndCertainReMeasurementsMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-17": {
   "value": "8498000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CostOfSales",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-18": {
   "value": "0",
   "decimals": -6,
   "dimensions": {
    "concept": "centrica:ReMeasurementAndSettlementOfEnergyContracts",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "centrica:GroupIncomeStatementAxis": "centrica:BusinessPerformanceMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-19": {
   "value": "-434000000",
   "decimals": -6,
   "dimensions": {
    "concept": "centrica:ReMeasurementAndSettlementOfEnergyContracts",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "centrica:GroupIncomeStatementAxis": "centrica:ExceptionalItemsAndCertainReMeasurementsMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-20": {
   "value": "-434000000",
   "decimals": -6,
   "dimensions": {
    "concept": "centrica:ReMeasurementAndSettlementOfEnergyContracts",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-21": {
   "value": "0",
   "decimals": -6,
   "dimensions": {
    "concept": "centrica:ReMeasurementAndSettlementOfEnergyContracts",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "centrica:GroupIncomeStatementAxis": "centrica:BusinessPerformanceMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-22": {
   "value": "-632000000",
   "decimals": -6,
   "dimensions": {
    "concept": "centrica:ReMeasurementAndSettlementOfEnergyContracts",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "centrica:GroupIncomeStatementAxis": "centrica:ExceptionalItemsAndCertainReMeasurementsMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-23": {
   "value": "-632000000",
   "decimals": -6,
   "dimensions": {
    "concept": "centrica:ReMeasurementAndSettlementOfEnergyContracts",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-24": {
   "value": "2870000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:GrossProfit",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "centrica:GroupIncomeStatementAxis": "centrica:BusinessPerformanceMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-25": {
   "value": "-1241000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:GrossProfit",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "centrica:GroupIncomeStatementAxis": "centrica:ExceptionalItemsAndCertainReMeasurementsMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-26": {
   "value": "1629000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:GrossProfit",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-27": {
   "value": "2333000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:GrossProfit",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "centrica:GroupIncomeStatementAxis": "centrica:BusinessPerformanceMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-28": {
   "value": "786000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:GrossProfit",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "centrica:GroupIncomeStatementAxis": "centrica:ExceptionalItemsAndCertainReMeasurementsMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-29": {
   "value": "3119000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:GrossProfit",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-30": {
   "value": "1703000000",
   "decimals": -6,
   "dimensions": {
    "concept": "centrica:OperatingCostsBeforeExceptionalItemsAndCreditLossesOnFinancialAssets",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "centrica:GroupIncomeStatementAxis": "centrica:BusinessPerformanceMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-31": {
   "value": "0",
   "decimals": -6,
   "dimensions": {
    "concept": "centrica:OperatingCostsBeforeExceptionalItemsAndCreditLossesOnFinancialAssets",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "centrica:GroupIncomeStatementAxis": "centrica:ExceptionalItemsAndCertainReMeasurementsMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-32": {
   "value": "1703000000",
   "decimals": -6,
   "dimensions": {
    "concept": "centrica:OperatingCostsBeforeExceptionalItemsAndCreditLossesOnFinancialAssets",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-33": {
   "value": "1714000000",
   "decimals": -6,
   "dimensions": {
    "concept": "centrica:OperatingCostsBeforeExceptionalItemsAndCreditLossesOnFinancialAssets",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "centrica:GroupIncomeStatementAxis": "centrica:BusinessPerformanceMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-34": {
   "value": "0",
   "decimals": -6,
   "dimensions": {
    "concept": "centrica:OperatingCostsBeforeExceptionalItemsAndCreditLossesOnFinancialAssets",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "centrica:GroupIncomeStatementAxis": "centrica:ExceptionalItemsAndCertainReMeasurementsMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-35": {
   "value": "1714000000",
   "decimals": -6,
   "dimensions": {
    "concept": "centrica:OperatingCostsBeforeExceptionalItemsAndCreditLossesOnFinancialAssets",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-36": {
   "value": "116000000",
   "decimals": -6,
   "dimensions": {
    "concept": "centrica:CreditLossesOnFinancialAssets",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "centrica:GroupIncomeStatementAxis": "centrica:BusinessPerformanceMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-37": {
   "value": "0",
   "decimals": -6,
   "dimensions": {
    "concept": "centrica:CreditLossesOnFinancialAssets",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "centrica:GroupIncomeStatementAxis": "centrica:ExceptionalItemsAndCertainReMeasurementsMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-38": {
   "value": "116000000",
   "decimals": -6,
   "dimensions": {
    "concept": "centrica:CreditLossesOnFinancialAssets",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-39": {
   "value": "195000000",
   "decimals": -6,
   "dimensions": {
    "concept": "centrica:CreditLossesOnFinancialAssets",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "centrica:GroupIncomeStatementAxis": "centrica:BusinessPerformanceMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-40": {
   "value": "0",
   "decimals": -6,
   "dimensions": {
    "concept": "centrica:CreditLossesOnFinancialAssets",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "centrica:GroupIncomeStatementAxis": "centrica:ExceptionalItemsAndCertainReMeasurementsMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-41": {
   "value": "195000000",
   "decimals": -6,
   "dimensions": {
    "concept": "centrica:CreditLossesOnFinancialAssets",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-42": {
   "value": "0",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLoss",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "centrica:GroupIncomeStatementAxis": "centrica:BusinessPerformanceMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-43": {
   "value": "-1218000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLoss",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "centrica:GroupIncomeStatementAxis": "centrica:ExceptionalItemsAndCertainReMeasurementsMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-44": {
   "value": "-1218000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLoss",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-45": {
   "value": "0",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLoss",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "centrica:GroupIncomeStatementAxis": "centrica:BusinessPerformanceMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-46": {
   "value": "1319000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLoss",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "centrica:GroupIncomeStatementAxis": "centrica:ExceptionalItemsAndCertainReMeasurementsMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-47": {
   "value": "1319000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLoss",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-48": {
   "value": "0",
   "decimals": -6,
   "dimensions": {
    "concept": "centrica:ExceptionalItemsNetRestructuringCostReversalsChargeAndOther",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "centrica:GroupIncomeStatementAxis": "centrica:BusinessPerformanceMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-49": {
   "value": "29000000",
   "decimals": -6,
   "dimensions": {
    "concept": "centrica:ExceptionalItemsNetRestructuringCostReversalsChargeAndOther",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "centrica:GroupIncomeStatementAxis": "centrica:ExceptionalItemsAndCertainReMeasurementsMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-50": {
   "value": "29000000",
   "decimals": -6,
   "dimensions": {
    "concept": "centrica:ExceptionalItemsNetRestructuringCostReversalsChargeAndOther",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-51": {
   "value": "0",
   "decimals": -6,
   "dimensions": {
    "concept": "centrica:ExceptionalItemsNetRestructuringCostReversalsChargeAndOther",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "centrica:GroupIncomeStatementAxis": "centrica:BusinessPerformanceMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-52": {
   "value": "-274000000",
   "decimals": -6,
   "dimensions": {
    "concept": "centrica:ExceptionalItemsNetRestructuringCostReversalsChargeAndOther",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "centrica:GroupIncomeStatementAxis": "centrica:ExceptionalItemsAndCertainReMeasurementsMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-53": {
   "value": "-274000000",
   "decimals": -6,
   "dimensions": {
    "concept": "centrica:ExceptionalItemsNetRestructuringCostReversalsChargeAndOther",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-54": {
   "value": "1819000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OperatingExpense",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "centrica:GroupIncomeStatementAxis": "centrica:BusinessPerformanceMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-55": {
   "value": "-1247000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OperatingExpense",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "centrica:GroupIncomeStatementAxis": "centrica:ExceptionalItemsAndCertainReMeasurementsMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-56": {
   "value": "572000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OperatingExpense",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-57": {
   "value": "1909000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OperatingExpense",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "centrica:GroupIncomeStatementAxis": "centrica:BusinessPerformanceMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-58": {
   "value": "1593000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OperatingExpense",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "centrica:GroupIncomeStatementAxis": "centrica:ExceptionalItemsAndCertainReMeasurementsMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-59": {
   "value": "3502000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OperatingExpense",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-60": {
   "value": "-103000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ShareOfProfitLossOfAssociatesAndJointVenturesAccountedForUsingEquityMethod",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "centrica:GroupIncomeStatementAxis": "centrica:BusinessPerformanceMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-61": {
   "value": "0",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ShareOfProfitLossOfAssociatesAndJointVenturesAccountedForUsingEquityMethod",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "centrica:GroupIncomeStatementAxis": "centrica:ExceptionalItemsAndCertainReMeasurementsMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-62": {
   "value": "-103000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ShareOfProfitLossOfAssociatesAndJointVenturesAccountedForUsingEquityMethod",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-63": {
   "value": "23000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ShareOfProfitLossOfAssociatesAndJointVenturesAccountedForUsingEquityMethod",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "centrica:GroupIncomeStatementAxis": "centrica:BusinessPerformanceMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-64": {
   "value": "-2000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ShareOfProfitLossOfAssociatesAndJointVenturesAccountedForUsingEquityMethod",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "centrica:GroupIncomeStatementAxis": "centrica:ExceptionalItemsAndCertainReMeasurementsMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-65": {
   "value": "21000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ShareOfProfitLossOfAssociatesAndJointVenturesAccountedForUsingEquityMethod",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-66": {
   "value": "948000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ProfitLossFromOperatingActivities",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "centrica:GroupIncomeStatementAxis": "centrica:BusinessPerformanceMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-67": {
   "value": "6000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ProfitLossFromOperatingActivities",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "centrica:GroupIncomeStatementAxis": "centrica:ExceptionalItemsAndCertainReMeasurementsMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-68": {
   "value": "954000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ProfitLossFromOperatingActivities",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-69": {
   "value": "447000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ProfitLossFromOperatingActivities",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "centrica:GroupIncomeStatementAxis": "centrica:BusinessPerformanceMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-70": {
   "value": "-809000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ProfitLossFromOperatingActivities",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "centrica:GroupIncomeStatementAxis": "centrica:ExceptionalItemsAndCertainReMeasurementsMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-71": {
   "value": "-362000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ProfitLossFromOperatingActivities",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-72": {
   "value": "-187000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:FinanceIncomeCost",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "centrica:GroupIncomeStatementAxis": "centrica:BusinessPerformanceMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-73": {
   "value": "0",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:FinanceIncomeCost",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "centrica:GroupIncomeStatementAxis": "centrica:ExceptionalItemsAndCertainReMeasurementsMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-74": {
   "value": "-187000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:FinanceIncomeCost",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-75": {
   "value": "-215000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:FinanceIncomeCost",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "centrica:GroupIncomeStatementAxis": "centrica:BusinessPerformanceMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-76": {
   "value": "0",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:FinanceIncomeCost",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "centrica:GroupIncomeStatementAxis": "centrica:ExceptionalItemsAndCertainReMeasurementsMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-77": {
   "value": "-215000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:FinanceIncomeCost",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-78": {
   "value": "761000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ProfitLossBeforeTax",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "centrica:GroupIncomeStatementAxis": "centrica:BusinessPerformanceMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-79": {
   "value": "6000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ProfitLossBeforeTax",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "centrica:GroupIncomeStatementAxis": "centrica:ExceptionalItemsAndCertainReMeasurementsMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-80": {
   "value": "767000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ProfitLossBeforeTax",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-81": {
   "value": "232000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ProfitLossBeforeTax",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "centrica:GroupIncomeStatementAxis": "centrica:BusinessPerformanceMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-82": {
   "value": "-809000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ProfitLossBeforeTax",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "centrica:GroupIncomeStatementAxis": "centrica:ExceptionalItemsAndCertainReMeasurementsMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-83": {
   "value": "-577000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ProfitLossBeforeTax",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-84": {
   "value": "454000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:IncomeTaxExpenseContinuingOperations",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "centrica:GroupIncomeStatementAxis": "centrica:BusinessPerformanceMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-85": {
   "value": "-236000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:IncomeTaxExpenseContinuingOperations",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "centrica:GroupIncomeStatementAxis": "centrica:ExceptionalItemsAndCertainReMeasurementsMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-86": {
   "value": "218000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:IncomeTaxExpenseContinuingOperations",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-87": {
   "value": "42000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:IncomeTaxExpenseContinuingOperations",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "centrica:GroupIncomeStatementAxis": "centrica:BusinessPerformanceMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-88": {
   "value": "-187000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:IncomeTaxExpenseContinuingOperations",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "centrica:GroupIncomeStatementAxis": "centrica:ExceptionalItemsAndCertainReMeasurementsMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-89": {
   "value": "-145000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:IncomeTaxExpenseContinuingOperations",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-90": {
   "value": "307000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ProfitLossFromContinuingOperations",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "centrica:GroupIncomeStatementAxis": "centrica:BusinessPerformanceMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-91": {
   "value": "242000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ProfitLossFromContinuingOperations",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "centrica:GroupIncomeStatementAxis": "centrica:ExceptionalItemsAndCertainReMeasurementsMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-92": {
   "value": "549000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ProfitLossFromContinuingOperations",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-93": {
   "value": "190000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ProfitLossFromContinuingOperations",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "centrica:GroupIncomeStatementAxis": "centrica:BusinessPerformanceMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-94": {
   "value": "-622000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ProfitLossFromContinuingOperations",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "centrica:GroupIncomeStatementAxis": "centrica:ExceptionalItemsAndCertainReMeasurementsMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-95": {
   "value": "-432000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ProfitLossFromContinuingOperations",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-96": {
   "value": "0",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ProfitLossFromDiscontinuedOperations",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "centrica:GroupIncomeStatementAxis": "centrica:BusinessPerformanceMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-97": {
   "value": "624000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ProfitLossFromDiscontinuedOperations",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "centrica:GroupIncomeStatementAxis": "centrica:ExceptionalItemsAndCertainReMeasurementsMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-98": {
   "value": "624000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ProfitLossFromDiscontinuedOperations",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-99": {
   "value": "213000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ProfitLossFromDiscontinuedOperations",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "centrica:GroupIncomeStatementAxis": "centrica:BusinessPerformanceMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-100": {
   "value": "102000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ProfitLossFromDiscontinuedOperations",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "centrica:GroupIncomeStatementAxis": "centrica:ExceptionalItemsAndCertainReMeasurementsMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-101": {
   "value": "315000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ProfitLossFromDiscontinuedOperations",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-102": {
   "value": "307000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ProfitLoss",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "centrica:GroupIncomeStatementAxis": "centrica:BusinessPerformanceMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-103": {
   "value": "866000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ProfitLoss",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "centrica:GroupIncomeStatementAxis": "centrica:ExceptionalItemsAndCertainReMeasurementsMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-104": {
   "value": "1173000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ProfitLoss",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-105": {
   "value": "403000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ProfitLoss",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "centrica:GroupIncomeStatementAxis": "centrica:BusinessPerformanceMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-106": {
   "value": "-520000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ProfitLoss",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "centrica:GroupIncomeStatementAxis": "centrica:ExceptionalItemsAndCertainReMeasurementsMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-107": {
   "value": "-117000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ProfitLoss",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-108": {
   "value": "237000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ProfitLossAttributableToOwnersOfParent",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "centrica:GroupIncomeStatementAxis": "centrica:BusinessPerformanceMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-109": {
   "value": "973000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ProfitLossAttributableToOwnersOfParent",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "centrica:GroupIncomeStatementAxis": "centrica:ExceptionalItemsAndCertainReMeasurementsMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-110": {
   "value": "1210000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ProfitLossAttributableToOwnersOfParent",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-111": {
   "value": "378000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ProfitLossAttributableToOwnersOfParent",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "centrica:GroupIncomeStatementAxis": "centrica:BusinessPerformanceMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-112": {
   "value": "-337000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ProfitLossAttributableToOwnersOfParent",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "centrica:GroupIncomeStatementAxis": "centrica:ExceptionalItemsAndCertainReMeasurementsMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-113": {
   "value": "41000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ProfitLossAttributableToOwnersOfParent",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-114": {
   "value": "70000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ProfitLossAttributableToNoncontrollingInterests",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "centrica:GroupIncomeStatementAxis": "centrica:BusinessPerformanceMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-115": {
   "value": "-107000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ProfitLossAttributableToNoncontrollingInterests",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "centrica:GroupIncomeStatementAxis": "centrica:ExceptionalItemsAndCertainReMeasurementsMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-116": {
   "value": "-37000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ProfitLossAttributableToNoncontrollingInterests",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-117": {
   "value": "25000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ProfitLossAttributableToNoncontrollingInterests",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "centrica:GroupIncomeStatementAxis": "centrica:BusinessPerformanceMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-118": {
   "value": "-183000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ProfitLossAttributableToNoncontrollingInterests",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "centrica:GroupIncomeStatementAxis": "centrica:ExceptionalItemsAndCertainReMeasurementsMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-119": {
   "value": "-158000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ProfitLossAttributableToNoncontrollingInterests",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-120": {
   "value": "0.207",
   "decimals": 3,
   "dimensions": {
    "concept": "ifrs-full:BasicEarningsLossPerShare",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:GBP/xbrli:shares"
   }
  },
  "fact-121": {
   "value": "0.007",
   "decimals": 3,
   "dimensions": {
    "concept": "ifrs-full:BasicEarningsLossPerShare",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:GBP/xbrli:shares"
   }
  },
  "fact-122": {
   "value": "0.205",
   "decimals": 3,
   "dimensions": {
    "concept": "ifrs-full:DilutedEarningsLossPerShare",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:GBP/xbrli:shares"
   }
  },
  "fact-123": {
   "value": "0.007",
   "decimals": 3,
   "dimensions": {
    "concept": "ifrs-full:DilutedEarningsLossPerShare",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:GBP/xbrli:shares"
   }
  },
  "fact-124": {
   "value": "0.10",
   "decimals": 3,
   "dimensions": {
    "concept": "ifrs-full:BasicEarningsLossPerShareFromContinuingOperations",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:GBP/xbrli:shares"
   }
  },
  "fact-125": {
   "value": "-0.047",
   "decimals": 3,
   "dimensions": {
    "concept": "ifrs-full:BasicEarningsLossPerShareFromContinuingOperations",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:GBP/xbrli:shares"
   }
  },
  "fact-126": {
   "value": "0.099",
   "decimals": 3,
   "dimensions": {
    "concept": "ifrs-full:DilutedEarningsLossPerShareFromContinuingOperations",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:GBP/xbrli:shares"
   }
  },
  "fact-127": {
   "value": "-0.047",
   "decimals": 3,
   "dimensions": {
    "concept": "ifrs-full:DilutedEarningsLossPerShareFromContinuingOperations",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:GBP/xbrli:shares"
   }
  },
  "fact-128": {
   "value": "0",
   "decimals": 3,
   "dimensions": {
    "concept": "centrica:InterimDividendPaidPerOrdinaryShare",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:GBP/xbrli:shares"
   }
  },
  "fact-129": {
   "value": "0",
   "decimals": 3,
   "dimensions": {
    "concept": "centrica:InterimDividendPaidPerOrdinaryShare",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:GBP/xbrli:shares"
   }
  },
  "fact-130": {
   "value": "0",
   "decimals": 3,
   "dimensions": {
    "concept": "ifrs-full:DividendsProposedOrDeclaredBeforeFinancialStatementsAuthorisedForIssueButNotRecognisedAsDistributionToOwnersPerShare",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:GBP/xbrli:shares"
   }
  },
  "fact-131": {
   "value": "0",
   "decimals": 3,
   "dimensions": {
    "concept": "ifrs-full:DividendsProposedOrDeclaredBeforeFinancialStatementsAuthorisedForIssueButNotRecognisedAsDistributionToOwnersPerShare",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:GBP/xbrli:shares"
   }
  },
  "fact-132": {
   "value": "1173000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ProfitLoss",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-133": {
   "value": "-117000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ProfitLoss",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-134": {
   "value": "-6000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeNetOfTaxCashFlowHedges",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-135": {
   "value": "9000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeNetOfTaxCashFlowHedges",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-136": {
   "value": "-49000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:GainsLossesOnExchangeDifferencesOnTranslationNetOfTax",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-137": {
   "value": "-54000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:GainsLossesOnExchangeDifferencesOnTranslationNetOfTax",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-138": {
   "value": "20000000",
   "decimals": -6,
   "dimensions": {
    "concept": "centrica:ExchangeDifferencesReclassifiedToGroupIncomeStatementOnDisposal",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-139": {
   "value": "-12000000",
   "decimals": -6,
   "dimensions": {
    "concept": "centrica:ExchangeDifferencesReclassifiedToGroupIncomeStatementOnDisposal",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-140": {
   "value": "-40000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:GainsLossesOnHedgesOfNetInvestmentsInForeignOperationsNetOfTax",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-141": {
   "value": "40000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:GainsLossesOnHedgesOfNetInvestmentsInForeignOperationsNetOfTax",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-142": {
   "value": "144000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeNetOfTaxGainsLossesOnRemeasurementsOfDefinedBenefitPlans",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-143": {
   "value": "-379000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeNetOfTaxGainsLossesOnRemeasurementsOfDefinedBenefitPlans",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-144": {
   "value": "3000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeNetOfTaxGainsLossesOnRevaluation",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-145": {
   "value": "-4000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncomeNetOfTaxGainsLossesOnRevaluation",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-146": {
   "value": "152000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ShareOfOtherComprehensiveIncomeOfAssociatesAndJointVenturesAccountedForUsingEquityMethodThatWillNotBeReclassifiedToProfitOrLossNetOfTax",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-147": {
   "value": "58000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ShareOfOtherComprehensiveIncomeOfAssociatesAndJointVenturesAccountedForUsingEquityMethodThatWillNotBeReclassifiedToProfitOrLossNetOfTax",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-148": {
   "value": "184000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncome",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-149": {
   "value": "-318000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncome",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-150": {
   "value": "1357000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ComprehensiveIncome",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-151": {
   "value": "-435000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ComprehensiveIncome",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-152": {
   "value": "1397000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ComprehensiveIncomeAttributableToOwnersOfParent",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-153": {
   "value": "-277000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ComprehensiveIncomeAttributableToOwnersOfParent",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-154": {
   "value": "-40000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ComprehensiveIncomeAttributableToNoncontrollingInterests",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-155": {
   "value": "-158000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ComprehensiveIncomeAttributableToNoncontrollingInterests",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-156": {
   "value": "833000000",
   "decimals": -6,
   "dimensions": {
    "concept": "centrica:ComprehensiveIncomeFromContinuingOperationsAttributableToOwnersOfParent",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-157": {
   "value": "-571000000",
   "decimals": -6,
   "dimensions": {
    "concept": "centrica:ComprehensiveIncomeFromContinuingOperationsAttributableToOwnersOfParent",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-158": {
   "value": "564000000",
   "decimals": -6,
   "dimensions": {
    "concept": "centrica:ComprehensiveIncomeFromDiscontinuedOperationsAttributableToOwnersOfParent",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-159": {
   "value": "294000000",
   "decimals": -6,
   "dimensions": {
    "concept": "centrica:ComprehensiveIncomeFromDiscontinuedOperationsAttributableToOwnersOfParent",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-160": {
   "value": "1397000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ComprehensiveIncomeAttributableToOwnersOfParent",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-161": {
   "value": "-277000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ComprehensiveIncomeAttributableToOwnersOfParent",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-162": {
   "value": "360000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:Equity",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:IssuedCapitalMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-163": {
   "value": "2330000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:Equity",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:SharePremiumMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-164": {
   "value": "-869000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:Equity",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:RetainedEarningsMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-165": {
   "value": "-609000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:Equity",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:OtherReservesMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-166": {
   "value": "1212000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:Equity",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:EquityAttributableToOwnersOfParentMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-167": {
   "value": "583000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:Equity",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:NoncontrollingInterestsMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-168": {
   "value": "1795000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:Equity",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-169": {
   "value": "0",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ProfitLoss",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:IssuedCapitalMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-170": {
   "value": "0",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ProfitLoss",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:SharePremiumMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-171": {
   "value": "41000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ProfitLoss",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:RetainedEarningsMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-172": {
   "value": "0",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ProfitLoss",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:OtherReservesMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-173": {
   "value": "41000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ProfitLoss",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:EquityAttributableToOwnersOfParentMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-174": {
   "value": "-158000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ProfitLoss",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:NoncontrollingInterestsMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-175": {
   "value": "-117000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ProfitLoss",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-176": {
   "value": "0",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncome",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:IssuedCapitalMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-177": {
   "value": "0",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncome",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:SharePremiumMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-178": {
   "value": "0",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncome",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:RetainedEarningsMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-179": {
   "value": "-318000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncome",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:OtherReservesMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-180": {
   "value": "-318000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncome",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:EquityAttributableToOwnersOfParentMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-181": {
   "value": "0",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncome",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:NoncontrollingInterestsMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-182": {
   "value": "-318000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncome",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-183": {
   "value": "0",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ComprehensiveIncome",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:IssuedCapitalMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-184": {
   "value": "0",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ComprehensiveIncome",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:SharePremiumMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-185": {
   "value": "41000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ComprehensiveIncome",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:RetainedEarningsMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-186": {
   "value": "-318000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ComprehensiveIncome",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:OtherReservesMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-187": {
   "value": "-277000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ComprehensiveIncome",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:EquityAttributableToOwnersOfParentMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-188": {
   "value": "-158000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ComprehensiveIncome",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:NoncontrollingInterestsMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-189": {
   "value": "-435000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ComprehensiveIncome",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-190": {
   "value": "1000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:IncreaseDecreaseThroughSharebasedPaymentTransactions",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:IssuedCapitalMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-191": {
   "value": "17000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:IncreaseDecreaseThroughSharebasedPaymentTransactions",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:SharePremiumMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-192": {
   "value": "-8000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:IncreaseDecreaseThroughSharebasedPaymentTransactions",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:RetainedEarningsMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-193": {
   "value": "12000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:IncreaseDecreaseThroughSharebasedPaymentTransactions",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:OtherReservesMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-194": {
   "value": "22000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:IncreaseDecreaseThroughSharebasedPaymentTransactions",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:EquityAttributableToOwnersOfParentMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-195": {
   "value": "0",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:IncreaseDecreaseThroughSharebasedPaymentTransactions",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:NoncontrollingInterestsMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-196": {
   "value": "22000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:IncreaseDecreaseThroughSharebasedPaymentTransactions",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-197": {
   "value": "361000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:Equity",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:IssuedCapitalMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-198": {
   "value": "2347000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:Equity",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:SharePremiumMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-199": {
   "value": "-836000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:Equity",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:RetainedEarningsMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-200": {
   "value": "-915000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:Equity",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:OtherReservesMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-201": {
   "value": "957000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:Equity",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:EquityAttributableToOwnersOfParentMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-202": {
   "value": "425000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:Equity",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:NoncontrollingInterestsMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-203": {
   "value": "1382000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:Equity",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-204": {
   "value": "0",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ProfitLoss",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:IssuedCapitalMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-205": {
   "value": "0",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ProfitLoss",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:SharePremiumMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-206": {
   "value": "1210000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ProfitLoss",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:RetainedEarningsMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-207": {
   "value": "0",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ProfitLoss",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:OtherReservesMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-208": {
   "value": "1210000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ProfitLoss",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:EquityAttributableToOwnersOfParentMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-209": {
   "value": "-37000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ProfitLoss",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:NoncontrollingInterestsMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-210": {
   "value": "1173000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ProfitLoss",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-211": {
   "value": "0",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncome",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:IssuedCapitalMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-212": {
   "value": "0",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncome",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:SharePremiumMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-213": {
   "value": "0",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncome",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:RetainedEarningsMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-214": {
   "value": "187000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncome",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:OtherReservesMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-215": {
   "value": "187000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncome",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:EquityAttributableToOwnersOfParentMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-216": {
   "value": "-3000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncome",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:NoncontrollingInterestsMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-217": {
   "value": "184000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherComprehensiveIncome",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-218": {
   "value": "0",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ComprehensiveIncome",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:IssuedCapitalMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-219": {
   "value": "0",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ComprehensiveIncome",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:SharePremiumMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-220": {
   "value": "1210000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ComprehensiveIncome",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:RetainedEarningsMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-221": {
   "value": "187000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ComprehensiveIncome",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:OtherReservesMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-222": {
   "value": "1397000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ComprehensiveIncome",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:EquityAttributableToOwnersOfParentMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-223": {
   "value": "-40000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ComprehensiveIncome",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:NoncontrollingInterestsMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-224": {
   "value": "1357000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ComprehensiveIncome",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-225": {
   "value": "2000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:IncreaseDecreaseThroughSharebasedPaymentTransactions",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:IssuedCapitalMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-226": {
   "value": "30000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:IncreaseDecreaseThroughSharebasedPaymentTransactions",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:SharePremiumMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-227": {
   "value": "3000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:IncreaseDecreaseThroughSharebasedPaymentTransactions",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:RetainedEarningsMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-228": {
   "value": "-24000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:IncreaseDecreaseThroughSharebasedPaymentTransactions",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:OtherReservesMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-229": {
   "value": "11000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:IncreaseDecreaseThroughSharebasedPaymentTransactions",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:EquityAttributableToOwnersOfParentMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-230": {
   "value": "0",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:IncreaseDecreaseThroughSharebasedPaymentTransactions",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:NoncontrollingInterestsMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-231": {
   "value": "11000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:IncreaseDecreaseThroughSharebasedPaymentTransactions",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-232": {
   "value": "363000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:Equity",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:IssuedCapitalMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-233": {
   "value": "2377000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:Equity",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:SharePremiumMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-234": {
   "value": "377000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:Equity",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:RetainedEarningsMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-235": {
   "value": "-752000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:Equity",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:OtherReservesMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-236": {
   "value": "2365000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:Equity",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:EquityAttributableToOwnersOfParentMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-237": {
   "value": "385000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:Equity",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2022-01-01T00:00:00",
    "ifrs-full:ComponentsOfEquityAxis": "ifrs-full:NoncontrollingInterestsMember",
    "unit": "iso4217:GBP"
   }
  },
  "fact-238": {
   "value": "2750000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:Equity",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-239": {
   "value": "1985000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:PropertyPlantAndEquipment",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-240": {
   "value": "2643000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:PropertyPlantAndEquipment",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-241": {
   "value": "1628000000",
   "decimals": -6,
   "dimensions": {
    "concept": "centrica:InterestsInJointVenturesAndAssociates",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-242": {
   "value": "843000000",
   "decimals": -6,
   "dimensions": {
    "concept": "centrica:InterestsInJointVenturesAndAssociates",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-243": {
   "value": "760000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:IntangibleAssetsOtherThanGoodwill",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-244": {
   "value": "1011000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:IntangibleAssetsOtherThanGoodwill",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-245": {
   "value": "401000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:Goodwill",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-246": {
   "value": "929000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:Goodwill",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-247": {
   "value": "823000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:DeferredTaxAssets",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-248": {
   "value": "636000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:DeferredTaxAssets",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-249": {
   "value": "233000000",
   "decimals": -6,
   "dimensions": {
    "concept": "centrica:NoncurrentTradeAndOtherReceivablesAndContractRelatedAssets",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-250": {
   "value": "145000000",
   "decimals": -6,
   "dimensions": {
    "concept": "centrica:NoncurrentTradeAndOtherReceivablesAndContractRelatedAssets",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-251": {
   "value": "1005000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:NoncurrentDerivativeFinancialAssets",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-252": {
   "value": "366000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:NoncurrentDerivativeFinancialAssets",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-253": {
   "value": "231000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:NoncurrentRecognisedAssetsDefinedBenefitPlan",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-254": {
   "value": "0",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:NoncurrentRecognisedAssetsDefinedBenefitPlan",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-255": {
   "value": "135000000",
   "decimals": -6,
   "dimensions": {
    "concept": "centrica:NoncurrentSecurities",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-256": {
   "value": "134000000",
   "decimals": -6,
   "dimensions": {
    "concept": "centrica:NoncurrentSecurities",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-257": {
   "value": "7201000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:NoncurrentAssets",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-258": {
   "value": "6707000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:NoncurrentAssets",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-259": {
   "value": "5881000000",
   "decimals": -6,
   "dimensions": {
    "concept": "centrica:CurrentTradeAndOtherReceivablesAndContractRelatedAssets",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-260": {
   "value": "2801000000",
   "decimals": -6,
   "dimensions": {
    "concept": "centrica:CurrentTradeAndOtherReceivablesAndContractRelatedAssets",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-261": {
   "value": "644000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:Inventories",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-262": {
   "value": "324000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:Inventories",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-263": {
   "value": "6545000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CurrentDerivativeFinancialAssets",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-264": {
   "value": "1224000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CurrentDerivativeFinancialAssets",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-265": {
   "value": "83000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CurrentTaxAssets",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-266": {
   "value": "132000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CurrentTaxAssets",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-267": {
   "value": "5060000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CashAndCashEquivalents",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-268": {
   "value": "1820000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CashAndCashEquivalents",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-269": {
   "value": "18213000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CurrentAssetsOtherThanAssetsOrDisposalGroupsClassifiedAsHeldForSaleOrAsHeldForDistributionToOwners",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-270": {
   "value": "6301000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CurrentAssetsOtherThanAssetsOrDisposalGroupsClassifiedAsHeldForSaleOrAsHeldForDistributionToOwners",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-271": {
   "value": "1672000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:NoncurrentAssetsOrDisposalGroupsClassifiedAsHeldForSale",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-272": {
   "value": "4111000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:NoncurrentAssetsOrDisposalGroupsClassifiedAsHeldForSale",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-273": {
   "value": "19885000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CurrentAssets",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-274": {
   "value": "10412000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CurrentAssets",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-275": {
   "value": "27086000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:Assets",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-276": {
   "value": "17119000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:Assets",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-277": {
   "value": "4929000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CurrentDerivativeFinancialLiabilities",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-278": {
   "value": "747000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CurrentDerivativeFinancialLiabilities",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-279": {
   "value": "7513000000",
   "decimals": -6,
   "dimensions": {
    "concept": "centrica:CurrentTradeAndOtherPayablesAndContractRelatedLiabilities",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-280": {
   "value": "3722000000",
   "decimals": -6,
   "dimensions": {
    "concept": "centrica:CurrentTradeAndOtherPayablesAndContractRelatedLiabilities",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-281": {
   "value": "333000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CurrentTaxLiabilities",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-282": {
   "value": "235000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CurrentTaxLiabilities",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-283": {
   "value": "2769000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CurrentProvisions",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-284": {
   "value": "188000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CurrentProvisions",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-285": {
   "value": "1204000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ShorttermBorrowings",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-286": {
   "value": "787000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ShorttermBorrowings",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-287": {
   "value": "16748000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CurrentLiabilitiesOtherThanLiabilitiesIncludedInDisposalGroupsClassifiedAsHeldForSale",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-288": {
   "value": "5679000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CurrentLiabilitiesOtherThanLiabilitiesIncludedInDisposalGroupsClassifiedAsHeldForSale",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-289": {
   "value": "1228000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:LiabilitiesIncludedInDisposalGroupsClassifiedAsHeldForSale",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-290": {
   "value": "1986000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:LiabilitiesIncludedInDisposalGroupsClassifiedAsHeldForSale",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-291": {
   "value": "17976000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CurrentLiabilities",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-292": {
   "value": "7665000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CurrentLiabilities",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-293": {
   "value": "36000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:DeferredTaxLiabilities",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-294": {
   "value": "149000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:DeferredTaxLiabilities",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-295": {
   "value": "1080000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:NoncurrentDerivativeFinancialLiabilities",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-296": {
   "value": "181000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:NoncurrentDerivativeFinancialLiabilities",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-297": {
   "value": "120000000",
   "decimals": -6,
   "dimensions": {
    "concept": "centrica:NoncurrentTradeAndOtherPayablesAndContractRelatedLiabilities",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-298": {
   "value": "114000000",
   "decimals": -6,
   "dimensions": {
    "concept": "centrica:NoncurrentTradeAndOtherPayablesAndContractRelatedLiabilities",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-299": {
   "value": "1454000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:NoncurrentProvisions",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-300": {
   "value": "2438000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:NoncurrentProvisions",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-301": {
   "value": "231000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:NoncurrentRecognisedLiabilitiesDefinedBenefitPlan",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-302": {
   "value": "601000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:NoncurrentRecognisedLiabilitiesDefinedBenefitPlan",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-303": {
   "value": "3439000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:LongtermBorrowings",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-304": {
   "value": "4589000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:LongtermBorrowings",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-305": {
   "value": "6360000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:NoncurrentLiabilities",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-306": {
   "value": "8072000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:NoncurrentLiabilities",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-307": {
   "value": "24336000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:Liabilities",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-308": {
   "value": "15737000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:Liabilities",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-309": {
   "value": "2750000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:NetAssetsLiabilities",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-310": {
   "value": "1382000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:NetAssetsLiabilities",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-311": {
   "value": "363000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:IssuedCapital",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-312": {
   "value": "361000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:IssuedCapital",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-313": {
   "value": "2377000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:SharePremium",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-314": {
   "value": "2347000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:SharePremium",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-315": {
   "value": "377000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:RetainedEarnings",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-316": {
   "value": "-836000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:RetainedEarnings",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-317": {
   "value": "-752000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherReserves",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-318": {
   "value": "-915000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:OtherReserves",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-319": {
   "value": "2365000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:EquityAttributableToOwnersOfParent",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-320": {
   "value": "957000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:EquityAttributableToOwnersOfParent",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-321": {
   "value": "385000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:NoncontrollingInterests",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-322": {
   "value": "425000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:NoncontrollingInterests",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-323": {
   "value": "2750000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:Equity",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-324": {
   "value": "1382000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:Equity",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-325": {
   "value": "954000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ProfitLossFromOperatingActivities",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-326": {
   "value": "-362000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ProfitLossFromOperatingActivities",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-327": {
   "value": "-103000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ShareOfProfitLossOfAssociatesAndJointVenturesAccountedForUsingEquityMethod",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-328": {
   "value": "21000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ShareOfProfitLossOfAssociatesAndJointVenturesAccountedForUsingEquityMethod",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-329": {
   "value": "1057000000",
   "decimals": -6,
   "dimensions": {
    "concept": "centrica:GroupOperatingLossBeforeShareOfResultsOfJointVenturesAndAssociates",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-330": {
   "value": "-383000000",
   "decimals": -6,
   "dimensions": {
    "concept": "centrica:GroupOperatingLossBeforeShareOfResultsOfJointVenturesAndAssociates",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-331": {
   "value": "-415000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:AdjustmentsForDepreciationAndAmortisationExpense",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-332": {
   "value": "2217000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:AdjustmentsForDepreciationAndAmortisationExpense",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-333": {
   "value": "28000000",
   "decimals": -6,
   "dimensions": {
    "concept": "centrica:AdjustmentsForLossOnDisposals",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-334": {
   "value": "28000000",
   "decimals": -6,
   "dimensions": {
    "concept": "centrica:AdjustmentsForLossOnDisposals",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-335": {
   "value": "2434000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:AdjustmentsForProvisions",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-336": {
   "value": "46000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:AdjustmentsForProvisions",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-337": {
   "value": "-388000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:AdjustmentsForIncreaseDecreaseInEmployeeBenefitLiabilities",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-338": {
   "value": "-42000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:AdjustmentsForIncreaseDecreaseInEmployeeBenefitLiabilities",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-339": {
   "value": "12000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:AdjustmentsForSharebasedPayments",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-340": {
   "value": "34000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:AdjustmentsForSharebasedPayments",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-341": {
   "value": "1159000000",
   "decimals": -6,
   "dimensions": {
    "concept": "centrica:AdjustmentsForUnrealisedGainsArisingFromReMeasurementOfEnergyContracts",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-342": {
   "value": "666000000",
   "decimals": -6,
   "dimensions": {
    "concept": "centrica:AdjustmentsForUnrealisedGainsArisingFromReMeasurementOfEnergyContracts",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-343": {
   "value": "12000000",
   "decimals": -6,
   "dimensions": {
    "concept": "centrica:AdjustmentsForExceptionalChargesReflectedDirectlyInOperatingProfit",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-344": {
   "value": "49000000",
   "decimals": -6,
   "dimensions": {
    "concept": "centrica:AdjustmentsForExceptionalChargesReflectedDirectlyInOperatingProfit",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-345": {
   "value": "1581000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CashFlowsFromUsedInOperationsBeforeChangesInWorkingCapital",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-346": {
   "value": "1283000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CashFlowsFromUsedInOperationsBeforeChangesInWorkingCapital",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-347": {
   "value": "-361000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:AdjustmentsForDecreaseIncreaseInInventories",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-348": {
   "value": "4000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:AdjustmentsForDecreaseIncreaseInInventories",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-349": {
   "value": "-3358000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:AdjustmentsForDecreaseIncreaseInTradeAndOtherReceivables",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-350": {
   "value": "363000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:AdjustmentsForDecreaseIncreaseInTradeAndOtherReceivables",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-351": {
   "value": "3965000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:AdjustmentsForIncreaseDecreaseInTradeAndOtherPayables",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-352": {
   "value": "-571000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:AdjustmentsForIncreaseDecreaseInTradeAndOtherPayables",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-353": {
   "value": "1827000000",
   "decimals": -6,
   "dimensions": {
    "concept": "centrica:OperatingCashFlowsBeforePaymentsRelatingToTaxesAndExceptionalCharges",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-354": {
   "value": "1079000000",
   "decimals": -6,
   "dimensions": {
    "concept": "centrica:OperatingCashFlowsBeforePaymentsRelatingToTaxesAndExceptionalCharges",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-355": {
   "value": "140000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:IncomeTaxesPaidRefundClassifiedAsOperatingActivities",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-356": {
   "value": "2000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:IncomeTaxesPaidRefundClassifiedAsOperatingActivities",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-357": {
   "value": "76000000",
   "decimals": -6,
   "dimensions": {
    "concept": "centrica:PaymentsRelatingToExceptionalChargesInOperatingCostsClassifiedAsOperatingActivities",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-358": {
   "value": "120000000",
   "decimals": -6,
   "dimensions": {
    "concept": "centrica:PaymentsRelatingToExceptionalChargesInOperatingCostsClassifiedAsOperatingActivities",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-359": {
   "value": "1611000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CashFlowsFromUsedInOperatingActivitiesContinuingOperations",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-360": {
   "value": "957000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CashFlowsFromUsedInOperatingActivitiesContinuingOperations",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-361": {
   "value": "0",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CashFlowsFromUsedInOperatingActivitiesDiscontinuedOperations",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-362": {
   "value": "443000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CashFlowsFromUsedInOperatingActivitiesDiscontinuedOperations",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-363": {
   "value": "1611000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CashFlowsFromUsedInOperatingActivities",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-364": {
   "value": "1400000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CashFlowsFromUsedInOperatingActivities",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-365": {
   "value": "14000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CashFlowsUsedInObtainingControlOfSubsidiariesOrOtherBusinessesClassifiedAsInvestingActivities",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-366": {
   "value": "-0",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CashFlowsUsedInObtainingControlOfSubsidiariesOrOtherBusinessesClassifiedAsInvestingActivities",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-367": {
   "value": "70000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CashFlowsFromLosingControlOfSubsidiariesOrOtherBusinessesClassifiedAsInvestingActivities",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-368": {
   "value": "43000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CashFlowsFromLosingControlOfSubsidiariesOrOtherBusinessesClassifiedAsInvestingActivities",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-369": {
   "value": "420000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-370": {
   "value": "489000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-371": {
   "value": "36000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ProceedsFromSalesOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-372": {
   "value": "0",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:ProceedsFromSalesOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-373": {
   "value": "2000000",
   "decimals": -6,
   "dimensions": {
    "concept": "centrica:DisposalOfInvestmentsInJointVenturesAndAssociatesClassifiedAsInvestingActivities",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-374": {
   "value": "-10000000",
   "decimals": -6,
   "dimensions": {
    "concept": "centrica:DisposalOfInvestmentsInJointVenturesAndAssociatesClassifiedAsInvestingActivities",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-375": {
   "value": "2000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:DividendsReceivedFromInvestmentsAccountedForUsingEquityMethodClassifiedAsInvestingActivities",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-376": {
   "value": "62000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:DividendsReceivedFromInvestmentsAccountedForUsingEquityMethodClassifiedAsInvestingActivities",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-377": {
   "value": "0",
   "decimals": -6,
   "dimensions": {
    "concept": "centrica:ReceiptOfSubLeaseCapitalPaymentsClassifiedAsInvestingActivities",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-378": {
   "value": "3000000",
   "decimals": -6,
   "dimensions": {
    "concept": "centrica:ReceiptOfSubLeaseCapitalPaymentsClassifiedAsInvestingActivities",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-379": {
   "value": "2000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:InterestReceivedClassifiedAsInvestingActivities",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-380": {
   "value": "7000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:InterestReceivedClassifiedAsInvestingActivities",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-381": {
   "value": "-3000000",
   "decimals": -6,
   "dimensions": {
    "concept": "centrica:SettlementAndSaleOfSecuritiesClassifiedAsInvestingActivities",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-382": {
   "value": "121000000",
   "decimals": -6,
   "dimensions": {
    "concept": "centrica:SettlementAndSaleOfSecuritiesClassifiedAsInvestingActivities",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-383": {
   "value": "-325000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CashFlowsFromUsedInInvestingActivitiesContinuingOperations",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-384": {
   "value": "-263000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CashFlowsFromUsedInInvestingActivitiesContinuingOperations",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-385": {
   "value": "2588000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CashFlowsFromUsedInInvestingActivitiesDiscontinuedOperations",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-386": {
   "value": "-22000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CashFlowsFromUsedInInvestingActivitiesDiscontinuedOperations",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-387": {
   "value": "2263000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CashFlowsFromUsedInInvestingActivities",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-388": {
   "value": "-285000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CashFlowsFromUsedInInvestingActivities",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-389": {
   "value": "-0",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:PaymentsToAcquireOrRedeemEntitysShares",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-390": {
   "value": "30000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:PaymentsToAcquireOrRedeemEntitysShares",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-391": {
   "value": "1000000",
   "decimals": -6,
   "dimensions": {
    "concept": "centrica:ProceedsFromSaleOfForfeitedShareCapitalClassifiedAsFinancingActivities",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-392": {
   "value": "0",
   "decimals": -6,
   "dimensions": {
    "concept": "centrica:ProceedsFromSaleOfForfeitedShareCapitalClassifiedAsFinancingActivities",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-393": {
   "value": "233000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:InterestPaidClassifiedAsFinancingActivities",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-394": {
   "value": "202000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:InterestPaidClassifiedAsFinancingActivities",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-395": {
   "value": "706000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:RepaymentsOfBorrowingsClassifiedAsFinancingActivities",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-396": {
   "value": "234000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:RepaymentsOfBorrowingsClassifiedAsFinancingActivities",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-397": {
   "value": "-938000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CashFlowsFromUsedInFinancingActivitiesContinuingOperations",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-398": {
   "value": "-466000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CashFlowsFromUsedInFinancingActivitiesContinuingOperations",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-399": {
   "value": "0",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CashFlowsFromUsedInFinancingActivitiesDiscontinuedOperations",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-400": {
   "value": "-16000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CashFlowsFromUsedInFinancingActivitiesDiscontinuedOperations",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-401": {
   "value": "-938000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CashFlowsFromUsedInFinancingActivities",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-402": {
   "value": "-482000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CashFlowsFromUsedInFinancingActivities",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-403": {
   "value": "2936000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:IncreaseDecreaseInCashAndCashEquivalentsBeforeEffectOfExchangeRateChanges",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-404": {
   "value": "633000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:IncreaseDecreaseInCashAndCashEquivalentsBeforeEffectOfExchangeRateChanges",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-405": {
   "value": "1393000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CashAndCashEquivalentsIfDifferentFromStatementOfFinancialPosition",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-406": {
   "value": "794000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CashAndCashEquivalentsIfDifferentFromStatementOfFinancialPosition",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-407": {
   "value": "-1000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:EffectOfExchangeRateChangesOnCashAndCashEquivalents",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-408": {
   "value": "-34000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:EffectOfExchangeRateChangesOnCashAndCashEquivalents",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2020-01-01T00:00:00/2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-409": {
   "value": "4328000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CashAndCashEquivalentsIfDifferentFromStatementOfFinancialPosition",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-410": {
   "value": "1393000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CashAndCashEquivalentsIfDifferentFromStatementOfFinancialPosition",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-411": {
   "value": "5060000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CashAndCashEquivalents",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-412": {
   "value": "1820000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CashAndCashEquivalents",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-413": {
   "value": "750000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:BankOverdraftsClassifiedAsCashEquivalents",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-414": {
   "value": "534000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:BankOverdraftsClassifiedAsCashEquivalents",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-415": {
   "value": "18000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CashAndCashEquivalentsClassifiedAsPartOfDisposalGroupHeldForSale",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2022-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-416": {
   "value": "107000000",
   "decimals": -6,
   "dimensions": {
    "concept": "ifrs-full:CashAndCashEquivalentsClassifiedAsPartOfDisposalGroupHeldForSale",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00",
    "unit": "iso4217:GBP"
   }
  },
  "fact-2": {
   "value": "Centrica plc",
   "dimensions": {
    "concept": "ifrs-full:NameOfReportingEntityOrOtherMeansOfIdentification",
    "language": "en",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00"
   }
  },
  "fact-418": {
   "value": "Centrica plc",
   "dimensions": {
    "concept": "ifrs-full:NameOfUltimateParentOfGroup",
    "language": "en",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00"
   }
  },
  "fact-3": {
   "value": "public company ",
   "dimensions": {
    "concept": "ifrs-full:LegalFormOfEntity",
    "language": "en",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00"
   }
  },
  "fact-4": {
   "value": "UK",
   "dimensions": {
    "concept": "ifrs-full:DomicileOfEntity",
    "language": "en",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00"
   }
  },
  "fact-417": {
   "value": "UK",
   "dimensions": {
    "concept": "ifrs-full:CountryOfIncorporation",
    "language": "en",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00"
   }
  },
  "fact-5": {
   "value": "Millstream, Maidenhead Road, Windsor, Berkshire, SL4 5GD.",
   "dimensions": {
    "concept": "ifrs-full:AddressOfRegisteredOfficeOfEntity",
    "language": "en",
    "entity": "scheme:E26EDV109X6EEPBKVH76",
    "period": "2021-01-01T00:00:00/2022-01-01T00:00:00"
   }
  }
 }
}