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Note 7 - Fair Value - Financial Instruments At Fair Value By Levels - Liabilities (Details) - EUR (€)
Jun. 30, 2020
Dec. 31, 2019
Disclosure Of Fair Value Measurement Of Liabilities Line Items    
Liabilities € 704,269,000,000 € 643,765,000,000
Financial Liabilities Held For Trading [Member] | Level 1 Of Fair Value Hierarchy Member    
Disclosure Of Fair Value Measurement Of Liabilities Line Items    
Liabilities 26,953,000,000 26,266,000,000
Financial Liabilities Held For Trading [Member] | Level 2 Of Fair Value Hierarchy Member    
Disclosure Of Fair Value Measurement Of Liabilities Line Items    
Liabilities 80,095,000,000 62,541,000,000
Financial Liabilities Held For Trading [Member] | Level 3 Of Fair Value Hierarchy Member    
Disclosure Of Fair Value Measurement Of Liabilities Line Items    
Liabilities 1,576,000,000 827,000,000
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 8,612,000,000 4,425,000,000
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 41,048,000,000 30,419,000,000
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 494,000,000 175,000,000
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 10,614,000,000 12,246,000,000
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 1,219,000,000 1,000,000
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 0 2,000,000
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 7,727,000,000 9,595,000,000
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 37,828,000,000 32,121,000,000
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 1,082,000,000 649,000,000
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
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 8,120,000,000 9,984,000,000
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 1,083,000,000 27,000,000
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 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 4,087,000,000 4,410,000,000
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 0 0
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 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 914,000,000 944,000,000
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 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 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 3,119,000,000 4,629,000,000
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 1,083,000,000 27,000,000
Financial LiabilitiesAt Amortized Cost | Level 1 Of Fair Value Hierarchy Member    
Disclosure Of Fair Value Measurement Of Liabilities Line Items    
Liabilities 92,354,000,000 67,229,000,000
Financial LiabilitiesAt Amortized Cost | Level 2 Of Fair Value Hierarchy Member    
Disclosure Of Fair Value Measurement Of Liabilities Line Items    
Liabilities 314,925,000,000 289,599,000,000
Financial LiabilitiesAt Amortized Cost | Level 3 Of Fair Value Hierarchy Member    
Disclosure Of Fair Value Measurement Of Liabilities Line Items    
Liabilities 150,399,000,000 159,082,000,000
Derivatives Hedge accounting [Member] | Level 1 Of Fair Value Hierarchy Member    
Disclosure Of Fair Value Measurement Of Liabilities Line Items    
Liabilities 48,000,000 30,000,000
Derivatives Hedge accounting [Member] | Level 2 Of Fair Value Hierarchy Member    
Disclosure Of Fair Value Measurement Of Liabilities Line Items    
Liabilities 2,287,000,000 2,192,000,000
Derivatives Hedge accounting [Member] | Level 3 Of Fair Value Hierarchy Member    
Disclosure Of Fair Value Measurement Of Liabilities Line Items    
Liabilities € 34,000,000 € 11,000,000