Income taxes paid, classified as operating activities Purchase of property, plant and equipment and purchase of investment property Purchase of property, plant and equipment and purchase of investment property 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 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 other information [Text Block] Disclosure of other information Other outflows of cash, classified as financing activities Other outflows of cash, classified as financing activities Other outflows of cash, classified as financing activities 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 Adjustments for increase (decrease) in trade and other payables Dividends recognised as distributions to owners Other inflows of cash, classified as financing activities Other inflows of cash, classified as financing activities Revenue From Non Regulated Activities Revenue From Non Regulated Activities Finance costs Profit (loss), attributable to owners of parent 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 Cash flows from (used in) financing activities 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 Tax effect on reclassification adjustments on non current assets held for sale reclassified to profit and loss Tax effect on reclassification adjustments on non current assets held for sale reclassified to profit and loss Tax effect on reclassification adjustments on non current assets held for sale reclassified to profit and loss Proceeds from and payments on financial liabilities Proceeds from and payments on financial liabilities Cash flows from (used in) investing activities Regulatory framework [Text Block] Regulatory framework Interim Dividend Enagas [Member] Interim Dividend Enagas Adjustments changes in value [Member] Adjustments changes in value 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 Inflows of cash from investing activities Adjustments for decrease (increase) in inventories Otros cobros/ pagos por inversiones Otros cobros/ pagos por inversiones Revenue From Regulated Activities Revenue From Regulated Activities Disclosure of capital structure financing and financial result explanatory [Text Block] Disclosure of capital structure financing and financial result explanatory Cash flows from (used in) operating activities Impairment loss recognised in profit or loss, on disposal of fixed assets Impairment loss recognised in profit or loss, on disposal of fixed assets 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 Employee benefits expense Current financial liabilities and current derivative financial assets Deuda financiera y derivados corrientes Outflows of cash from investing activities Reclassification adjustments on cash flow hedges, before tax, Full consolidation method Reclassification adjustments on cash flow hedges, before tax, Full consolidation method Change in fair value of financial instrument Change in fair value of financial instrument Adquisición de instrumentos financieros, clasificada como actividades de inversión New accounting standards [Text Block] New accounting standards Impairment and result from disposal of financial instruments Impairment and result from disposal of financial instruments Increase (decrease) in cash and cash equivalents Total Fondos Propios Total Fondos Propios. Total Fondos Propios. Consolidated profit for the year attributed to minority interests Consolidated profit for the year attributed to minority interests Increase (decrease) in working capital Treasury shares Adjustments for decrease (increase) in trade and other receivables 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 Depreciation and amortisation expense Interim Dividend Interim Dividend Dividendo activo a cuenta Other cash flows from investing activities Other cash flows from investing activities Other cash flows from investing activities Balance sheet magnitudes [Text Block] Balance sheet magnitudes Profit and loss account figures [Text Block] Profit and loss account figures Disclosure of operational performance [Text Block] Disclosure of operational performance 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 Reclassification adjustments on exchange differences on translation, before tax, non current assets held for sale, that will be reclassified to profit or loss Profit loss from financing activities Profit loss from financing activities Reclassification adjustments on cash flow hedges, before tax, on non current assets held for sale reclassified to profit and loss Reclassification adjustments on cash flow hedges, before tax, on non current assets held for sale reclassified to profit and loss 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 Equity attributable to owners of parent - with adjustment [Member] Equity attributable to owners of parent - with adjustment 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 Comprehensive income, attributable to non-controlling interests, attributable to results Comprehensive income, attributable to non-controlling interests, attributable to results