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Note 13 - Financial assets at fair value through other comprehensive income - Accumulated other comprehensive income items that may be reclassified to profit or loss available for sale financial assets (Details) - EUR (€) | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
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Debt Securities [Member] |  |  |
Financial assets at fair value throught other comprehensive income Line Items |  |  |
Total Financial Assets At The Beginning | € 1,760,000,000 | € 943,000,000 | € 1,557,000,000
Effects of changes in accounting policies IFRS 9 |  |  | (58,000,000)
Valuation gains and losses | 489,000,000 | 1,267,000,000 | (640,000,000)
Amounts transferred to income | (72,000,000) | (119,000,000) | (137,000,000)
Income tax financial assets at fair value | (107,000,000) | (331,000,000) | 221,000,000
Total Financial Assets At The End | 2,069,000,000 | 1,760,000,000 | 943,000,000
Equity instruments [Member] |  |  |
Financial assets at fair value throught other comprehensive income Line Items |  |  |
Total Financial Assets At The Beginning | (403,000,000) | (155,000,000) | 84,000,000
Effects of changes in accounting policies IFRS 9 |  |  | (40,000,000)
Valuation gains and losses | (876,000,000) | (238,000,000) | (174,000,000)
Imports Trasferred To Reserves Debt Securities | 0 | 0 | 0
Income tax financial assets at fair value | 23,000,000 | (10,000,000) | (25,000,000)
Total Financial Assets At The End | € (1,256,000,000) | € (403,000,000) | € (155,000,000)

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