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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