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Note 7 - Risk Management -Liquidity Risk - Asset Encumbrance (Details) - EUR (€)
€ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Debt Securities [Member] | Encumbered Assets [Member] | Gross carrying amount [Member]      
Encumbered Assets Line Items      
Encumbered Assets € 31,157 € 28,700 € 40,114
Debt Securities [Member] | Encumbered Assets [Member] | Fair Value Member      
Encumbered Assets Line Items      
Encumbered Assets 32,216 29,798 39,972
Debt Securities [Member] | Non Encumbered Assets [Member] | Gross carrying amount [Member]      
Encumbered Assets Line Items      
Encumbered Assets 82,209 84,391 90,679
Debt Securities [Member] | Non Encumbered Assets [Member] | Fair Value Member      
Encumbered Assets Line Items      
Encumbered Assets 82,209 84,391 90,679
Equity instruments [Member] | Encumbered Assets [Member] | Gross carrying amount [Member]      
Encumbered Assets Line Items      
Encumbered Assets 1,864 2,297 2,214
Equity instruments [Member] | Encumbered Assets [Member] | Fair Value Member      
Encumbered Assets Line Items      
Encumbered Assets 1,864 2,297 2,214
Equity instruments [Member] | Non Encumbered Assets [Member] | Gross carrying amount [Member]      
Encumbered Assets Line Items      
Encumbered Assets 6,485 9,616 9,022
Equity instruments [Member] | Non Encumbered Assets [Member] | Fair Value Member      
Encumbered Assets Line Items      
Encumbered Assets 6,485 9,616 9,022
Loans And Receivables And Other Assets [Member] | Encumbered Assets [Member] | Gross carrying amount [Member]      
Encumbered Assets Line Items      
Encumbered Assets 74,928 79,604 94,718
Loans And Receivables And Other Assets [Member] | Non Encumbered Assets [Member] | Gross carrying amount [Member]      
Encumbered Assets Line Items      
Encumbered Assets € 478,880 € 485,451 € 495,109