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Note 8 - Fair Value - Carrying Value And Fair Value - Assets (Details) - EUR (€) | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Carrying Value And Fair Value Assets Line Items |  |  |
Assets | € 736,176,000,000 | € 697,737,000,000 | € 675,675,000,000
Cash cash balances at central banks and other demand deposits [Member] | Book Value [Member] |  |  |
Carrying Value And Fair Value Assets Line Items |  |  |
Assets | 65,520,000,000 | 44,303,000,000 | 58,196,000,000
Cash cash balances at central banks and other demand deposits [Member] | Fair Value Member |  |  |
Carrying Value And Fair Value Assets Line Items |  |  |
Financial Assets at fair value | 65,520,000,000 | 44,303,000,000 | 58,196,000,000
Financial Assets Held For Trading [Member] | Book Value [Member] |  |  |
Carrying Value And Fair Value Assets Line Items |  |  |
Assets | 108,257,000,000 | 101,735,000,000 | 89,103,000,000
Financial Assets Held For Trading [Member] | Fair Value Member |  |  |
Carrying Value And Fair Value Assets Line Items |  |  |
Financial Assets at fair value | 108,257,000,000 | 101,735,000,000 | 89,103,000,000
Non Trading Financial Assets Mandatorily At Fair Value Through Profit Or Loss [Member] | Book Value [Member] |  |  |
Carrying Value And Fair Value Assets Line Items |  |  |
Assets | 5,198,000,000 | 5,557,000,000 | 5,135,000,000
Non Trading Financial Assets Mandatorily At Fair Value Through Profit Or Loss [Member] | Fair Value Member |  |  |
Carrying Value And Fair Value Assets Line Items |  |  |
Financial Assets at fair value | 5,198,000,000 | 5,557,000,000 | 5,135,000,000
Financial assets designated at fair value through profit or loss [Member] | Book Value [Member] |  |  |
Carrying Value And Fair Value Assets Line Items |  |  |
Assets | 1,117,000,000 | 1,214,000,000 | 1,313,000,000
Financial assets designated at fair value through profit or loss [Member] | Fair Value Member |  |  |
Carrying Value And Fair Value Assets Line Items |  |  |
Financial Assets at fair value | 1,117,000,000 | 1,214,000,000 | 1,313,000,000
Financial Assets At Fair Value Through Other Comprehensive Income [Member] | Book Value [Member] |  |  |
Carrying Value And Fair Value Assets Line Items |  |  |
Assets | 69,440,000,000 | 61,183,000,000 | 56,337,000,000
Financial Assets At Fair Value Through Other Comprehensive Income [Member] | Fair Value Member |  |  |
Carrying Value And Fair Value Assets Line Items |  |  |
Financial Assets at fair value | 69,440,000,000 | 61,183,000,000 | 56,337,000,000
Financial Assets At Amortised Cost Member | Book Value [Member] |  |  |
Carrying Value And Fair Value Assets Line Items |  |  |
Assets | 367,668,000,000 | 439,162,000,000 | 419,660,000,000
Financial Assets At Amortised Cost Member | Fair Value Member |  |  |
Carrying Value And Fair Value Assets Line Items |  |  |
Financial Assets at fair value | 374,267,000,000 | 442,788,000,000 | 419,857,000,000
Derivatives Hedge accounting [Member] | Book Value [Member] |  |  |
Carrying Value And Fair Value Assets Line Items |  |  |
Assets | 1,991,000,000 | 1,729,000,000 | 2,892,000,000
Derivatives Hedge accounting [Member] | Fair Value Member |  |  |
Carrying Value And Fair Value Assets Line Items |  |  |
Financial Assets at fair value | € 1,991,000,000 | € 1,729,000,000 | € 2,892,000,000

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