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Note 16 - Investments in subsidiaries, joint ventures and associates - Associates Entities and joint ventures - Changes in the Year (Details) - EUR (€)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Investments in subsidiaries, joint ventures and associates      
Investments In Subsidiaries Joint VenturesAnd Associates At The Beginning € 1,488,000,000 € 1,578,000,000 € 1,588,000,000
Acquisitions And Capital Increases 257,000,000 161,000,000 309,000,000
Disposals And Capital Reductions (47,000,000) (149,000,000) (516,000,000)
Transfers And Changes Of Consolidation method (7,000,000) (27,000,000) 211,000,000
Share Of Profit And Loss (39,000,000) (42,000,000) (7,000,000)
Exchange Differences (27,000,000) 10,000,000 2,000,000
Dividends Valuation Adjustments And Others (188,000,000) (43,000,000) (8,000,000)
Investments In Subsidiaries Joint Ventures And Associates At The End € 1,437,000,000 € 1,488,000,000 € 1,578,000,000