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Note 7 - Fair Value - Carrying Value And Fair Value - Assets (Details) - EUR (€)
Jun. 30, 2020
Dec. 31, 2019
Carrying Value And Fair Value Assets Line Items    
Assets € 753,824,000,000 € 698,690,000,000
Cash cash balances at central banks and other demand deposits [Member] | Book Value [Member]    
Carrying Value And Fair Value Assets Line Items    
Assets 65,877,000,000 44,303,000,000
Cash cash balances at central banks and other demand deposits [Member] | Fair Value Member    
Carrying Value And Fair Value Assets Line Items    
Assets 65,877,000,000 44,303,000,000
Financial Assets Held For Trading [Member] | Book Value [Member]    
Carrying Value And Fair Value Assets Line Items    
Assets 119,332,000,000 102,688,000,000
Financial Assets Held For Trading [Member] | Fair Value Member    
Carrying Value And Fair Value Assets Line Items    
Assets 119,332,000,000 102,688,000,000
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 4,998,000,000 5,557,000,000
Non Trading Financial Assets Mandatorily At Fair Value Through Profit Or Loss [Member] | Fair Value Member    
Carrying Value And Fair Value Assets Line Items    
Assets 4,998,000,000 5,557,000,000
Financial assets designated at fair value through profit or loss [Member] | Book Value [Member]    
Carrying Value And Fair Value Assets Line Items    
Assets 1,098,000,000 1,214,000,000
Financial assets designated at fair value through profit or loss [Member] | Fair Value Member    
Carrying Value And Fair Value Assets Line Items    
Assets 1,098,000,000 1,214,000,000
Financial Assets At Fair Value Through Other Comprehensive Income [Member] | Book Value [Member]    
Carrying Value And Fair Value Assets Line Items    
Assets 70,045,000,000 61,183,000,000
Financial Assets At Fair Value Through Other Comprehensive Income [Member] | Fair Value Member    
Carrying Value And Fair Value Assets Line Items    
Assets 70,045,000,000 61,183,000,000
Financial Assets At Amortised Cost Member | Book Value [Member]    
Carrying Value And Fair Value Assets Line Items    
Assets 450,222,000,000 439,162,000,000
Financial Assets At Amortised Cost Member | Fair Value Member    
Carrying Value And Fair Value Assets Line Items    
Assets 452,719,000,000 442,788,000,000
Derivatives Hedge accounting [Member] | Book Value [Member]    
Carrying Value And Fair Value Assets Line Items    
Assets 2,531,000,000 1,729,000,000
Derivatives Hedge accounting [Member] | Fair Value Member    
Carrying Value And Fair Value Assets Line Items    
Assets € 2,531,000,000 € 1,729,000,000