Dividends recognised as distributions to owners Disclosure of key management personnel remuneration [Text Block] Disclosure of key management personnel remuneration Share of other comprehensive income of associates and joint ventures accounted for using equity method that will not be reclassified to profit or loss, net of tax Disclosure of other information [Text Block] Disclosure of other information Purchase of property, plant and equipment and purchase of investment property Purchase of property, plant and equipment and purchase of investment property Profit loss of the year Profit loss of the year Acquisition of equity instruments Acquisition of equity instruments Acquisition of equity instruments Share premium and reserves [Member] Share premium and reserves Disclosure of changes in consolidation scope [Text Block] Disclosure of changes in consolidation scope Other comprehensive income, before tax, exchange differences on translation full consolidation method Other comprehensive income, before tax, exchange differences on translation full consolidation method De activos no corrientes mantenidos para la venta Total other comprehensive income on non current assets held for sale Total other comprehensive income on non current assets held for sale Other cash flows from financing activities Other cash flows from financing activities Other cash flows from financing activities Sale of equity instruments Sale of equity instruments Depreciation and amortisation expense Increase (decrease) in working capital Disclosure of provisions and contingent liabilities explanatory [Text Block] Disclosure of provisions and contingent liabilities explanatory Revenue From Non Regulated Activities Revenue From Non Regulated Activities Tax effect on reclassification adjustments on companies accounted for using the full consolidation method that will be reclassified to Profit or Loss Tax effect on reclassification adjustments on companies accounted for using the full consolidation method, that will be reclassified to Profit or Loss Disclosure of commitments and guarantees [Text Block] Disclosure of commitments and guarantees Regulatory framework [Text Block] Regulatory framework Effects of changes in the consolidation method Effects of changes in the consolidation method Cobros/ (pagos) por instrumentos de patrimonio Proceeds and payments for equity instruments Proceeds and payments for equity instruments Tax effect on gains losses on companies accounted for using the full consolidation method Tax effect on gains losses on companies accounted for using the full consolidation method Adjustments for decrease (increase) in trade and other receivables Proceeds from and payments on financial liabilities Proceeds from and payments on financial liabilities Disclosure of financial assets and liabilities explanatory [Text Block] Disclosure of financial assets and liabilities explanatory Outflows of cash from investing activities Disclosure of additional information [Text Block] Disclosure of additional information Disclosure of operational performance [Text Block] Disclosure of operational performance Interim Dividend Enagas [Member] Interim Dividend Enagas Profit and loss account figures [Text Block] Profit and loss account figures Description of accounting policy for investments accounted for using equity method [Text Block] Description of accounting policy for investments accounted for using equity method Adjustments changes in value [Member] Adjustments changes in value Disclosure of general information and basis of preparation of financial statements [Text Block] Disclosure of general information and basis of preparation of financial statements Adjustments for increase (decrease) in trade and other payables Profit and Loss [Member] Profit and Loss Non current financial liabilities and non current derivative financial assets Deuda financiera y derivados no corrientes De activos no corrientes mantenidos para la venta Reclassification adjustments on non current assets held for sale reclassified to profit and loss Reclassification adjustments on non current assets held for sale reclassified to profit and loss Total Other comprehensive income on companies accounted for using the full consolidation method Total Other comprehensive income on companies accounted for using the full consolidation method Total Other comprehensive income on companies accounted for using the full consolidation method Adjustments For Changes In Value Ajustes por cambio de valor Increase (decrease) through transactions between equity items Increase (decrease) through transactions between equity items Profit (loss), attributable to owners of parent Employee benefits expense Disclosure of cash flows [Text Block] Disclosure of cash flows Adquisición de instrumentos financieros, clasificada como actividades de inversión Revenue From Regulated Activities Revenue From Regulated Activities Cash flows from (used in) operating activities New accounting standards [Text Block] New accounting standards Impairment loss recognised in profit or loss, on disposal of fixed assets Impairment loss recognised in profit or loss, on disposal of fixed assets Current financial liabilities and current derivative financial assets Deuda financiera y derivados corrientes Reclassification adjustments on cash flow hedges, before tax, Full consolidation method Reclassification adjustments on cash flow hedges, before tax, Full consolidation method Treasury shares Change in fair value of financial instrument Change in fair value of financial instrument Impairment and result from disposal of financial instruments Impairment and result from disposal of financial instruments Balance sheet magnitudes [Text Block] Balance sheet magnitudes Finance costs Adjustments for decrease (increase) in inventories Consolidated profit for the year attributed to minority interests Consolidated profit for the year attributed to minority interests Other cash flows from operating activities Other cash flows from operating activities Adjustments for decrease increase in other current assets and in other current liabilities Adjustments for decrease increase in other current assets and in other current liabilities Cash flows from (used in) investing activities Interim Dividend Dividendo activo a cuenta Other cash flows from investing activities Other cash flows from investing activities Other cash flows from investing activities Disclosure of capital structure financing and financial result explanatory [Text Block] Disclosure of capital structure financing and financial result explanatory Increase (decrease) in cash and cash equivalents Aspects related to Covid -19 [Text Block] Aspects related to Covid -19 Adjustments for decrease increase in other non current assets and in other non current liabilities Adjustments for decrease increase in other non current assets and in other non current liabilities Increase (decrease) through changes in consolidation scope Increase (decrease) through changes in consolidation scope Reclassification adjustments on exchange differences on translation, before tax, non current assets held for sale, that will be reclassified to profit or loss Reclassification adjustments on exchange differences on translation, before tax, non current assets held for sale, that will be reclassified to profit or loss Disclosure of derivative financial instruments explanatory [Text Block] Disclosure of derivative financial instruments explanatory Profit loss from financing activities Profit loss from financing activities Share of other comprehensive income of associates and joint ventures accounted for using equity method that will be reclassified to profit or loss, net of tax Other comprehensive income, before tax, exchange differences on non current assets held for sale Other comprehensive income, before tax, exchange differences on non current assets held for sale Inflows of cash from investing activities Equity attributable to owners of parent - with adjustment [Member] Equity attributable to owners of parent - with adjustment Cash flows from (used in) financing activities Reclassification adjustments on companies accounted for using the full consolidation method reclassified to profit and losseclassifiedToProfitandLoss Reclassification adjustments on companies accounted for using the full consolidation method reclassified to profit and loss Reclassification adjustments on companies accounted for using the full consolidation method reclassified to profit and loss Other Changes Other Changes Reclassification adjustments on exchange differences on translation, before tax, Full Consolidation Method Reclassification adjustments on exchange differences on translation, before tax, Full Consolidation Method Income taxes paid, classified as operating activities Comprehensive income, attributable to non-controlling interests, attributable to results Comprehensive income, attributable to non-controlling interests, attributable to results