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Note 7 - Risk Management -Liquidity Risk - Collateral received (Details) - EUR (€) | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
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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

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