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Note 8 - Fair Value - Carrying Value And Fair Value - Liabilities (Details) - EUR (€)
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Carrying Value And Fair Value Liabilities Line Items      
Liabilities € 643,765,000,000 € 623,814,000,000 € 636,736,000,000
Financial Liabilities Held For Trading [Member] | Book Value [Member]      
Carrying Value And Fair Value Liabilities Line Items      
Liabilities 89,633,000,000 80,774,000,000 46,182,000,000
Financial Liabilities Held For Trading [Member] | Fair Value Member      
Carrying Value And Fair Value Liabilities Line Items      
Liabilities 89,633,149,000 80,774,053,000 46,182,000,000
Financial liabilities designated at fair value throuh profit or loss [Member] | Book Value [Member]      
Carrying Value And Fair Value Liabilities Line Items      
Liabilities 10,010,000,000 6,993,000,000 2,222,000,000
Financial liabilities designated at fair value throuh profit or loss [Member] | Fair Value Member      
Carrying Value And Fair Value Liabilities Line Items      
Liabilities 10,010,264,000 6,993,275,000 2,222,000,000
Financial liabilities at amortized cost [Member] | Book Value [Member]      
Carrying Value And Fair Value Liabilities Line Items      
Liabilities 516,641,000,000 509,185,000,000 543,713,000,000
Financial liabilities at amortized cost [Member] | Fair Value Member      
Carrying Value And Fair Value Liabilities Line Items      
Liabilities 515,910,367,000 510,299,958,000 544,604,000,000
Derivatives Hedge accounting [Member] | Book Value [Member]      
Carrying Value And Fair Value Liabilities Line Items      
Liabilities 2,233,000,000 2,680,000,000 2,880,000,000
Derivatives Hedge accounting [Member] | Fair Value Member      
Carrying Value And Fair Value Liabilities Line Items      
Liabilities € 2,232,966,000 € 2,679,777,000 € 2,880,000,000