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Note 7 - Risk Management -Liquidity Risk - Asset Encumbrance (Details) - EUR (€)
€ in Millions
Dec. 31, 2017
Dec. 31, 2016
Equity instruments [Member] | Encumbered Assets [Member] | Carriying Value [Member]    
Encumbered Assets Line Items    
Encumbered Assets € 2,297 € 2,214
Equity instruments [Member] | Encumbered Assets [Member] | Fair Market Value [Member]    
Encumbered Assets Line Items    
Encumbered Assets 2,297 2,214
Equity instruments [Member] | Non Encumbered Assets [Member] | Carriying Value [Member]    
Encumbered Assets Line Items    
Encumbered Assets 9,616 9,022
Equity instruments [Member] | Non Encumbered Assets [Member] | Fair Market Value [Member]    
Encumbered Assets Line Items    
Encumbered Assets 9,616 9,022
Debt Securities [Member] | Encumbered Assets [Member] | Carriying Value [Member]    
Encumbered Assets Line Items    
Encumbered Assets 28,700 40,114
Debt Securities [Member] | Encumbered Assets [Member] | Fair Market Value [Member]    
Encumbered Assets Line Items    
Encumbered Assets 29,798 39,972
Debt Securities [Member] | Non Encumbered Assets [Member] | Carriying Value [Member]    
Encumbered Assets Line Items    
Encumbered Assets 84,391 90,679
Debt Securities [Member] | Non Encumbered Assets [Member] | Fair Market Value [Member]    
Encumbered Assets Line Items    
Encumbered Assets 84,391 90,679
Loans and Other Assets [Member] | Encumbered Assets [Member] | Carriying Value [Member]    
Encumbered Assets Line Items    
Encumbered Assets 79,604 94,718
Loans and Other Assets [Member] | Encumbered Assets [Member] | Fair Market Value [Member]    
Encumbered Assets Line Items    
Encumbered Assets 0  
Loans and Other Assets [Member] | Non Encumbered Assets [Member] | Carriying Value [Member]    
Encumbered Assets Line Items    
Encumbered Assets 485,451 € 495,109
Loans and Other Assets [Member] | Non Encumbered Assets [Member] | Fair Market Value [Member]    
Encumbered Assets Line Items    
Encumbered Assets € 0