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Note 7 - Risk Management -Liquidity Risk - Collateral received (Details) - EUR (€)
€ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Fair Value Of Encumbered Collateral Received [Member]      
Collateral Received Encumbered Asset Line Items      
Encumbered Collateral Received € 27,474 € 23,881 € 19,921
Fair Value Of Collateral Received [Member]      
Collateral Received Encumbered Asset Line Items      
Encumbered Collateral Received 5,633 9,630 10,039
Notional Amount Of Collateral Received [Member]      
Collateral Received Encumbered Asset Line Items      
Encumbered Collateral Received 319 201 173
Debt Securities [Member] | Fair Value Of Encumbered Collateral Received [Member]      
Collateral Received Encumbered Asset Line Items      
Encumbered Collateral Received 89 103 58
Debt Securities [Member] | Fair Value Of Collateral Received [Member]      
Collateral Received Encumbered Asset Line Items      
Encumbered Collateral Received 82 5 59
Debt Securities [Member] | Notional Amount Of Collateral Received [Member]      
Collateral Received Encumbered Asset Line Items      
Encumbered Collateral Received 0 0 0
Equity instruments [Member] | Fair Value Of Encumbered Collateral Received [Member]      
Collateral Received Encumbered Asset Line Items      
Encumbered Collateral Received 27,385 23,715 19,863
Equity instruments [Member] | Fair Value Of Collateral Received [Member]      
Collateral Received Encumbered Asset Line Items      
Encumbered Collateral Received 5,542 9,619 8,230
Equity instruments [Member] | Notional Amount Of Collateral Received [Member]      
Collateral Received Encumbered Asset Line Items      
Encumbered Collateral Received 300 121 28
Loans And Receivables And Other Assets [Member] | Fair Value Of Encumbered Collateral Received [Member]      
Collateral Received Encumbered Asset Line Items      
Encumbered Collateral Received 0 63 0
Loans And Receivables And Other Assets [Member] | Fair Value Of Collateral Received [Member]      
Collateral Received Encumbered Asset Line Items      
Encumbered Collateral Received 8 6 1,750
Loans And Receivables And Other Assets [Member] | Notional Amount Of Collateral Received [Member]      
Collateral Received Encumbered Asset Line Items      
Encumbered Collateral Received 19 80 144
Own Debt Issued Other Than Own Covered Bonds Member [Member] | Fair Value Of Encumbered Collateral Received [Member]      
Collateral Received Encumbered Asset Line Items      
Encumbered Collateral Received 78 3 5
Own Debt Issued Other Than Own Covered Bonds Member [Member] | Fair Value Of Collateral Received [Member]      
Collateral Received Encumbered Asset Line Items      
Encumbered Collateral Received 87 161 0
Own Debt Issued Other Than Own Covered Bonds Member [Member] | Notional Amount Of Collateral Received [Member]      
Collateral Received Encumbered Asset Line Items      
Encumbered Collateral Received € 0 € 0 € 0