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Note 7 - Risk Management -Liquidity Risk - Collateral received (Details) - EUR (€)
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Fair Value Of Encumbered Collateral Received [Member]      
Collateral Received Encumbered Asset Line Items      
Encumbered Collateral Received € 30,723,000,000 € 38,496,000,000 € 27,474,000,000
Fair Value Of Collateral Received [Member]      
Collateral Received Encumbered Asset Line Items      
Encumbered Collateral Received 8,652,000,000 9,208,000,000 5,633,000,000
Notional Amount Of Collateral Received [Member]      
Collateral Received Encumbered Asset Line Items      
Encumbered Collateral Received 1,071,000,000 48,000,000 319,000,000
Equity instruments [Member] | Fair Value Of Encumbered Collateral Received [Member]      
Collateral Received Encumbered Asset Line Items      
Encumbered Collateral Received 239,000,000 65,000,000 89,000,000
Equity instruments [Member] | Fair Value Of Collateral Received [Member]      
Collateral Received Encumbered Asset Line Items      
Encumbered Collateral Received 204,000,000 70,000,000 82,000,000
Equity instruments [Member] | Notional Amount Of Collateral Received [Member]      
Collateral Received Encumbered Asset Line Items      
Encumbered Collateral Received 0 0 0
Debt Securities [Member] | Fair Value Of Encumbered Collateral Received [Member]      
Collateral Received Encumbered Asset Line Items      
Encumbered Collateral Received 30,484,000,000 38,431,000,000 27,385,000,000
Debt Securities [Member] | Fair Value Of Collateral Received [Member]      
Collateral Received Encumbered Asset Line Items      
Encumbered Collateral Received 8,448,000,000 9,130,000,000 5,542,000,000
Debt Securities [Member] | Notional Amount Of Collateral Received [Member]      
Collateral Received Encumbered Asset Line Items      
Encumbered Collateral Received 1,071,000,000 38,000,000 300,000,000
Loans And Receivables And Other Assets [Member] | Fair Value Of Encumbered Collateral Received [Member]      
Collateral Received Encumbered Asset Line Items      
Encumbered Collateral Received 0 0 0
Loans And Receivables And Other Assets [Member] | Fair Value Of Collateral Received [Member]      
Collateral Received Encumbered Asset Line Items      
Encumbered Collateral Received 0 8,000,000 8,000,000
Loans And Receivables And Other Assets [Member] | Notional Amount Of Collateral Received [Member]      
Collateral Received Encumbered Asset Line Items      
Encumbered Collateral Received 0 10,000,000 19,000,000
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 3,000,000 0 78,000,000
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 94,000,000 82,000,000 87,000,000
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