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Note 8 - Fair Value - Carrying Value And Fair Value - Liabilities (Details) - EUR (€)
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Carrying Value And Fair Value Liabilities Line Items      
Liabilities € 686,156,000,000 € 642,812,000,000 € 622,801,000,000
Financial Liabilities Held For Trading [Member] | Book Value [Member]      
Carrying Value And Fair Value Liabilities Line Items      
Liabilities 86,488,000,000 88,680,000,000 79,761,000,000
Financial Liabilities Held For Trading [Member] | Fair Value Member      
Carrying Value And Fair Value Liabilities Line Items      
Financial liabilities at fair value 86,488,000,000 88,680,000,000 79,761,000,000
Financial liabilities designated at fair value throuh profit or loss [Member] | Book Value [Member]      
Carrying Value And Fair Value Liabilities Line Items      
Liabilities 10,050,000,000 10,010,000,000 6,993,000,000
Financial liabilities designated at fair value throuh profit or loss [Member] | Fair Value Member      
Carrying Value And Fair Value Liabilities Line Items      
Financial liabilities at fair value 10,050,000,000 10,010,000,000 6,993,000,000
Financial liabilities at amortized cost [Member] | Book Value [Member]      
Carrying Value And Fair Value Liabilities Line Items      
Liabilities 490,606,000,000 516,641,000,000 509,185,000,000
Financial liabilities at amortized cost [Member] | Fair Value Member      
Carrying Value And Fair Value Liabilities Line Items      
Financial liabilities at fair value 491,006,000,000 515,910,000,000 510,300,000,000
Derivatives Hedge accounting [Member] | Book Value [Member]      
Carrying Value And Fair Value Liabilities Line Items      
Liabilities 2,318,000,000 2,233,000,000 2,680,000,000
Derivatives Hedge accounting [Member] | Fair Value Member      
Carrying Value And Fair Value Liabilities Line Items      
Financial liabilities at fair value € 2,318,000,000 € 2,233,000,000 € 2,680,000,000