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Note 8 - Fair Value - Financial Instruments At Fair Value By Levels - Assets (Details) - EUR (€)
€ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Financial Assets Held For Trading [Member] | Classes Financial Instruments [Member] | Level 1 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Assets Line Items      
Assets € 26,730 € 29,057 € 32,544
Financial Assets Held For Trading [Member] | Classes Financial Instruments [Member] | Level 2 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Assets Line Items      
Assets 62,983 35,349 42,221
Financial Assets Held For Trading [Member] | Classes Financial Instruments [Member] | Level 3 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Assets Line Items      
Assets 404 289 184
Financial Assets Held For Trading [Member] | Loans and advances to Customers [Member] | Level 1 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Assets Line Items      
Assets 47 0 0
Financial Assets Held For Trading [Member] | Loans and advances to Customers [Member] | Level 2 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Assets Line Items      
Assets 28,642 56 154
Financial Assets Held For Trading [Member] | Loans and advances to Customers [Member] | Level 3 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Assets Line Items      
Assets 60 0 0
Financial Assets Held For Trading [Member] | Debt Securities [Member] | Level 1 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Assets Line Items      
Assets 17,884 21,107 26,720
Financial Assets Held For Trading [Member] | Debt Securities [Member] | Level 2 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Assets Line Items      
Assets 7,494 1,444 418
Financial Assets Held For Trading [Member] | Debt Securities [Member] | Level 3 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Assets Line Items      
Assets 199 22 28
Financial Assets Held For Trading [Member] | Equity instruments [Member] | Level 1 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Assets Line Items      
Assets 5,194 6,688 4,570
Financial Assets Held For Trading [Member] | Equity instruments [Member] | Level 2 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Assets Line Items      
Assets 0 33 9
Financial Assets Held For Trading [Member] | Equity instruments [Member] | Level 3 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Assets Line Items      
Assets 60 80 96
Financial Assets Held For Trading [Member] | Derivatives [Member] | Level 1 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Assets Line Items      
Assets 3,605 1,262 1,254
Financial Assets Held For Trading [Member] | Derivatives [Member] | Level 2 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Assets Line Items      
Assets 26,846 33,815 41,640
Financial Assets Held For Trading [Member] | Derivatives [Member] | Level 3 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Assets Line Items      
Assets 85 187 60
Non Trading Financial Assets Mandatorily At Fair Value Through Profit Or Loss [Member] | Classes Financial Instruments [Member] | Level 1 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Assets Line Items      
Assets 3,127    
Non Trading Financial Assets Mandatorily At Fair Value Through Profit Or Loss [Member] | Classes Financial Instruments [Member] | Level 2 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Assets Line Items      
Assets 78    
Non Trading Financial Assets Mandatorily At Fair Value Through Profit Or Loss [Member] | Classes Financial Instruments [Member] | Level 3 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Assets Line Items      
Assets 1,929    
Non Trading Financial Assets Mandatorily At Fair Value Through Profit Or Loss [Member] | Loans and advances to Customers [Member] | Level 1 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Assets Line Items      
Assets 25    
Non Trading Financial Assets Mandatorily At Fair Value Through Profit Or Loss [Member] | Loans and advances to Customers [Member] | Level 2 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Assets Line Items      
Assets 0    
Non Trading Financial Assets Mandatorily At Fair Value Through Profit Or Loss [Member] | Loans and advances to Customers [Member] | Level 3 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Assets Line Items      
Assets 1,778    
Non Trading Financial Assets Mandatorily At Fair Value Through Profit Or Loss [Member] | Debt Securities [Member] | Level 1 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Assets Line Items      
Assets 90    
Non Trading Financial Assets Mandatorily At Fair Value Through Profit Or Loss [Member] | Debt Securities [Member] | Level 2 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Assets Line Items      
Assets 71    
Non Trading Financial Assets Mandatorily At Fair Value Through Profit Or Loss [Member] | Debt Securities [Member] | Level 3 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Assets Line Items      
Assets 76    
Non Trading Financial Assets Mandatorily At Fair Value Through Profit Or Loss [Member] | Equity instruments [Member] | Level 1 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Assets Line Items      
Assets 3,012    
Non Trading Financial Assets Mandatorily At Fair Value Through Profit Or Loss [Member] | Equity instruments [Member] | Level 2 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Assets Line Items      
Assets 8    
Non Trading Financial Assets Mandatorily At Fair Value Through Profit Or Loss [Member] | Equity instruments [Member] | Level 3 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Assets Line Items      
Assets 75    
Financial assets designated at fair value through profit or loss [Member] | Classes Financial Instruments [Member] | Level 1 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Assets Line Items      
Assets 1,313 2,061 2,062
Financial assets designated at fair value through profit or loss [Member] | Classes Financial Instruments [Member] | Level 2 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Assets Line Items      
Assets 0 648 0
Financial assets designated at fair value through profit or loss [Member] | Classes Financial Instruments [Member] | Level 3 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Assets Line Items      
Assets 0 0 0
Financial assets designated at fair value through profit or loss [Member] | Loans and advances to Customers [Member] | Level 1 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Assets Line Items      
Assets 0 0 0
Financial assets designated at fair value through profit or loss [Member] | Loans and advances to Customers [Member] | Level 2 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Assets Line Items      
Assets 0 648 0
Financial assets designated at fair value through profit or loss [Member] | Loans and advances to Customers [Member] | Level 3 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Assets Line Items      
Assets 0 0 0
Financial assets designated at fair value through profit or loss [Member] | Loans And Advances To Credit Institutions [Member] | Level 1 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Assets Line Items      
Assets   0 0
Financial assets designated at fair value through profit or loss [Member] | Loans And Advances To Credit Institutions [Member] | Level 2 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Assets Line Items      
Assets   0 0
Financial assets designated at fair value through profit or loss [Member] | Loans And Advances To Credit Institutions [Member] | Level 3 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Assets Line Items      
Assets   0 0
Financial assets designated at fair value through profit or loss [Member] | Debt Securities [Member] | Level 1 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Assets Line Items      
Assets   174 142
Financial assets designated at fair value through profit or loss [Member] | Debt Securities [Member] | Level 2 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Assets Line Items      
Assets   0 0
Financial assets designated at fair value through profit or loss [Member] | Debt Securities [Member] | Level 3 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Assets Line Items      
Assets   0 0
Financial assets designated at fair value through profit or loss [Member] | Equity instruments [Member] | Level 1 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Assets Line Items      
Assets 1,313 1,888 1,920
Financial assets designated at fair value through profit or loss [Member] | Equity instruments [Member] | Level 2 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Assets Line Items      
Assets 0 0 0
Financial assets designated at fair value through profit or loss [Member] | Equity instruments [Member] | Level 3 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Assets Line Items      
Assets 0 0 0
Financial assets designated at fair value through profit or loss [Member] | Derivatives [Member] | Level 1 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Assets Line Items      
Assets 0    
Financial assets designated at fair value through profit or loss [Member] | Derivatives [Member] | Level 2 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Assets Line Items      
Assets 0    
Financial assets designated at fair value through profit or loss [Member] | Derivatives [Member] | Level 3 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Assets Line Items      
Assets 0    
Financial Assets At Fair Value Through Other Comprehensive Income [Member] | Classes Financial Instruments [Member] | Level 1 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Assets Line Items      
Assets 45,824    
Financial Assets At Fair Value Through Other Comprehensive Income [Member] | Classes Financial Instruments [Member] | Level 2 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Assets Line Items      
Assets 9,323    
Financial Assets At Fair Value Through Other Comprehensive Income [Member] | Classes Financial Instruments [Member] | Level 3 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Assets Line Items      
Assets 1,190    
Financial Assets At Fair Value Through Other Comprehensive Income [Member] | Loans and advances to Customers [Member] | Level 1 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Assets Line Items      
Assets 33    
Financial Assets At Fair Value Through Other Comprehensive Income [Member] | Loans and advances to Customers [Member] | Level 2 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Assets Line Items      
Assets 0    
Financial Assets At Fair Value Through Other Comprehensive Income [Member] | Loans and advances to Customers [Member] | Level 3 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Assets Line Items      
Assets 0    
Financial Assets At Fair Value Through Other Comprehensive Income [Member] | Debt Securities [Member] | Level 1 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Assets Line Items      
Assets 43,788    
Financial Assets At Fair Value Through Other Comprehensive Income [Member] | Debt Securities [Member] | Level 2 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Assets Line Items      
Assets 9,211    
Financial Assets At Fair Value Through Other Comprehensive Income [Member] | Debt Securities [Member] | Level 3 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Assets Line Items      
Assets 711    
Financial Assets At Fair Value Through Other Comprehensive Income [Member] | Equity instruments [Member] | Level 1 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Assets Line Items      
Assets 2,003    
Financial Assets At Fair Value Through Other Comprehensive Income [Member] | Equity instruments [Member] | Level 2 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Assets Line Items      
Assets 113    
Financial Assets At Fair Value Through Other Comprehensive Income [Member] | Equity instruments [Member] | Level 3 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Assets Line Items      
Assets 479    
Available for sale financial assets [Member] | Classes Financial Instruments [Member] | Level 1 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Assets Line Items      
Assets   57,381 62,125
Available for sale financial assets [Member] | Classes Financial Instruments [Member] | Level 2 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Assets Line Items      
Assets   11,082 15,894
Available for sale financial assets [Member] | Classes Financial Instruments [Member] | Level 3 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Assets Line Items      
Assets   544 637
Available for sale financial assets [Member] | Debt Securities [Member] | Level 1 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Assets Line Items      
Assets   54,850 58,372
Available for sale financial assets [Member] | Debt Securities [Member] | Level 2 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Assets Line Items      
Assets   10,948 15,779
Available for sale financial assets [Member] | Debt Securities [Member] | Level 3 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Assets Line Items      
Assets   454 429
Available for sale financial assets [Member] | Equity instruments [Member] | Level 1 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Assets Line Items      
Assets   2,531 3,753
Available for sale financial assets [Member] | Equity instruments [Member] | Level 2 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Assets Line Items      
Assets   134 115
Available for sale financial assets [Member] | Equity instruments [Member] | Level 3 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Assets Line Items      
Assets   90 208
Derivatives Hedge accounting [Member] | Classes Financial Instruments [Member] | Level 1 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Assets Line Items      
Assets 7 0 41
Derivatives Hedge accounting [Member] | Classes Financial Instruments [Member] | Level 2 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Assets Line Items      
Assets 2,882 2,483 2,792
Derivatives Hedge accounting [Member] | Classes Financial Instruments [Member] | Level 3 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Assets Line Items      
Assets € 3 € 2 € 0