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Note 8 - Fair Value - Carrying Value And Fair Value - Liabilities (Details) - EUR (€)
€ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Carrying Value And Fair Value Liabilities Line Items      
Liabilities € 623,814 € 636,736 € 676,428
Financial Liabilities Held For Trading [Member]      
Carrying Value And Fair Value Liabilities Line Items      
Liabilities 80,774 46,182 54,675
Financial liabilities at fair value 80,774 46,182 54,675
Financial liabilities designated at fair value throuh profit or loss [Member]      
Carrying Value And Fair Value Liabilities Line Items      
Liabilities 6,993 2,222 2,338
Financial liabilities at fair value 6,993 2,222 2,338
Financial liabilities at amortized cost [Member]      
Carrying Value And Fair Value Liabilities Line Items      
Liabilities 509,185 543,713 589,210
Financial liabilities at fair value 510,300 544,604 594,190
Derivatives Hedge accounting [Member]      
Carrying Value And Fair Value Liabilities Line Items      
Liabilities 2,680 2,880 2,347
Financial liabilities at fair value € 2,680 € 2,880 € 2,347