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Note 7 - Fair Value - Carrying Value And Fair Value - Assets (Details) - EUR (€)
€ in Millions
Jun. 30, 2019
Dec. 31, 2018
Carrying Value And Fair Value Assets Line Items    
Assets € 697,626 € 676,689
Cash cash balances at central banks and other demand deposits [Member]    
Carrying Value And Fair Value Assets Line Items    
Financial Assets At Carrying Amount 44,565 58,196
Financial Assets at fair value 44,565 58,196
Financial Assets Held For Trading [Member]    
Carrying Value And Fair Value Assets Line Items    
Financial Assets At Carrying Amount 105,369 90,117
Financial Assets at fair value 105,369 90,117
Non Trading Financial Assets Mandatorily At Fair Value Through Profit Or Loss [Member]    
Carrying Value And Fair Value Assets Line Items    
Financial Assets At Carrying Amount 4,918 5,135
Financial Assets at fair value 4,918 5,135
Financial assets designated at fair value through profit or loss [Member]    
Carrying Value And Fair Value Assets Line Items    
Financial Assets At Carrying Amount 1,403 1,313
Financial Assets at fair value 1,403 1,313
Financial Assets At Fair Value Through Other Comprehensive Income [Member]    
Carrying Value And Fair Value Assets Line Items    
Financial Assets At Carrying Amount 63,364 56,337
Financial Assets at fair value 63,364 56,337
Financial Assets At Amortised Cost Member    
Carrying Value And Fair Value Assets Line Items    
Financial Assets At Carrying Amount 430,930 419,660
Financial Assets at fair value 431,066 419,857
Derivatives Hedge accounting [Member]    
Carrying Value And Fair Value Assets Line Items    
Financial Assets At Carrying Amount 3,105 2,892
Financial Assets at fair value € 3,105 € 2,892