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Note 8 - Fair Value - Financial Instruments At Fair Value By Levels - Liabilities (Details) - EUR (€)
€ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure Of Fair Value Measurement Of Liabilities Line Items      
Liabilities € 623,814 € 636,736 € 676,428
Financial Liabilities Held For Trading [Member] | Level 1 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Liabilities Line Items      
Liabilities 22,932 11,191 12,502
Financial Liabilities Held For Trading [Member] | Level 2 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Liabilities Line Items      
Liabilities 57,573 34,866 42,120
Financial Liabilities Held For Trading [Member] | Level 3 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Liabilities Line Items      
Liabilities 269 125 53
Financial Liabilities Held For Trading [Member] | Derivatives [Member] | Level 1 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Liabilities Line Items      
Liabilities 3,919 1,183 952
Financial Liabilities Held For Trading [Member] | Derivatives [Member] | Level 2 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Liabilities Line Items      
Liabilities 27,628 34,866 42,120
Financial Liabilities Held For Trading [Member] | Derivatives [Member] | Level 3 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Liabilities Line Items      
Liabilities 267 119 47
Financial Liabilities Held For Trading [Member] | Short Positions [Member] | Level 1 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Liabilities Line Items      
Liabilities   10,008 11,550
Financial Liabilities Held For Trading [Member] | Short Positions [Member] | Level 2 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Liabilities Line Items      
Liabilities   0 0
Financial Liabilities Held For Trading [Member] | Short Positions [Member] | Level 3 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Liabilities Line Items      
Liabilities   6 6
Financial Liabilities Held For Trading [Member] | Deposits [Member] | Level 1 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Liabilities Line Items      
Liabilities 7,989    
Financial Liabilities Held For Trading [Member] | Deposits [Member] | Level 2 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Liabilities Line Items      
Liabilities 29,945    
Financial Liabilities Held For Trading [Member] | Deposits [Member] | Level 3 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Liabilities Line Items      
Liabilities 0    
Financial Liabilities Held For Trading [Member] | Other Financial Liabilities [Member] | Level 1 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Liabilities Line Items      
Liabilities 11,024    
Financial Liabilities Held For Trading [Member] | Other Financial Liabilities [Member] | Level 2 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Liabilities Line Items      
Liabilities 0    
Financial Liabilities Held For Trading [Member] | Other Financial Liabilities [Member] | Level 3 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Liabilities Line Items      
Liabilities 1    
Financial liabilities designated at fair value throuh profit or loss [Member] | Level 1 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Liabilities Line Items      
Liabilities 0 0 0
Financial liabilities designated at fair value throuh profit or loss [Member] | Level 2 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Liabilities Line Items      
Liabilities 4,478 2,222 2,338
Financial liabilities designated at fair value throuh profit or loss [Member] | Level 3 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Liabilities Line Items      
Liabilities 2,515 0 0
Financial liabilities designated at fair value throuh profit or loss [Member] | Other Financial Liabilities [Member] | Level 1 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Liabilities Line Items      
Liabilities 0    
Financial liabilities designated at fair value throuh profit or loss [Member] | Other Financial Liabilities [Member] | Level 2 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Liabilities Line Items      
Liabilities 643    
Financial liabilities designated at fair value throuh profit or loss [Member] | Other Financial Liabilities [Member] | Level 3 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Liabilities Line Items      
Liabilities 2,515    
Financial liabilities designated at fair value throuh profit or loss [Member] | Customer Deposits [Member] | Level 1 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Liabilities Line Items      
Liabilities 0    
Financial liabilities designated at fair value throuh profit or loss [Member] | Customer Deposits [Member] | Level 2 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Liabilities Line Items      
Liabilities 976    
Financial liabilities designated at fair value throuh profit or loss [Member] | Customer Deposits [Member] | Level 3 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Liabilities Line Items      
Liabilities 0    
Financial liabilities designated at fair value throuh profit or loss [Member] | Debt Certificates [Member] | Level 1 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Liabilities Line Items      
Liabilities 0    
Financial liabilities designated at fair value throuh profit or loss [Member] | Debt Certificates [Member] | Level 2 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Liabilities Line Items      
Liabilities 2,858    
Financial liabilities designated at fair value throuh profit or loss [Member] | Debt Certificates [Member] | Level 3 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Liabilities Line Items      
Liabilities 0    
Derivatives Hedge accounting [Member] | Level 1 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Liabilities Line Items      
Liabilities 223 274 94
Derivatives Hedge accounting [Member] | Level 2 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Liabilities Line Items      
Liabilities 2,454 2,606 2,189
Derivatives Hedge accounting [Member] | Level 3 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Liabilities Line Items      
Liabilities € 3 € 0 € 64