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Note 7 - Fair Value - Carrying Value And Fair Value - Liabilities (Details) - EUR (€)
Jun. 30, 2020
Dec. 31, 2019
Carrying Value And Fair Value Liabilities Line Items    
Liabilities € 704,269,000,000 € 643,765,000,000
Financial Liabilities Held For Trading [Member] | Book Value [Member]    
Carrying Value And Fair Value Liabilities Line Items    
Liabilities 108,624,000,000 89,633,000,000
Financial Liabilities Held For Trading [Member] | Fair Value Member    
Carrying Value And Fair Value Liabilities Line Items    
Liabilities 108,624,000,000 89,633,000,000
Financial liabilities designated at fair value throuh profit or loss [Member] | Book Value [Member]    
Carrying Value And Fair Value Liabilities Line Items    
Liabilities 9,203,000,000 10,010,000,000
Financial liabilities designated at fair value throuh profit or loss [Member] | Fair Value Member    
Carrying Value And Fair Value Liabilities Line Items    
Liabilities 9,203,000,000 10,010,000,000
Financial liabilities at amortized cost [Member] | Book Value [Member]    
Carrying Value And Fair Value Liabilities Line Items    
Liabilities 559,713,000,000 516,641,000,000
Financial liabilities at amortized cost [Member] | Fair Value Member    
Carrying Value And Fair Value Liabilities Line Items    
Liabilities 557,678,000,000 515,910,000,000
Derivatives Hedge accounting [Member] | Book Value [Member]    
Carrying Value And Fair Value Liabilities Line Items    
Liabilities 2,368,000,000 2,233,000,000
Derivatives Hedge accounting [Member] | Fair Value Member    
Carrying Value And Fair Value Liabilities Line Items    
Liabilities € 2,368,000,000 € 2,233,000,000