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Note 8 - Fair Value - Fair Value Instruments Carried At Cost - Main Valuation Techniques - Assets (Details) - EUR (€) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure Of Fair Value Instruments Carried At Cost Main Valuation Techniques Assets Line Items |  |  |
Contributed To Consolidated Group Assets | € 736,176,000,000 | € 697,737,000,000 | € 675,675,000,000
Level 2 Of Fair Value Hierarchy Member | Financial Assets At Amortised Cost Member |  |  |
Disclosure Of Fair Value Instruments Carried At Cost Main Valuation Techniques Assets Line Items |  |  |
Contributed To Consolidated Group Assets | 15,066,000,000 | 217,279,000,000 | 204,619,000,000
Level 2 Of Fair Value Hierarchy Member | Financial Assets At Amortised Cost Member | Central Banks [Member] |  |  |
Disclosure Of Fair Value Instruments Carried At Cost Main Valuation Techniques Assets Line Items |  |  |
Contributed To Consolidated Group Assets | 0 | 0 | 0
Level 2 Of Fair Value Hierarchy Member | Financial Assets At Amortised Cost Member | Loans And Advances To Credit Institutions [Member] |  |  |
Disclosure Of Fair Value Instruments Carried At Cost Main Valuation Techniques Assets Line Items |  |  |
Contributed To Consolidated Group Assets | 1,883,000,000 | 9,049,000,000 | 4,934,000,000
Level 2 Of Fair Value Hierarchy Member | Financial Assets At Amortised Cost Member | Customers [Member] |  |  |
Disclosure Of Fair Value Instruments Carried At Cost Main Valuation Techniques Assets Line Items |  |  |
Contributed To Consolidated Group Assets | 3,904,000,000 | 194,897,000,000 | 190,666,000,000
Level 2 Of Fair Value Hierarchy Member | Financial Assets At Amortised Cost Member | Debt Securities [Member] |  |  |
Disclosure Of Fair Value Instruments Carried At Cost Main Valuation Techniques Assets Line Items |  |  |
Contributed To Consolidated Group Assets | 9,279,000,000 | 13,333,000,000 | 9,019,000,000
Level 3 Of Fair Value Hierarchy Member | Financial Assets At Amortised Cost Member |  |  |
Disclosure Of Fair Value Instruments Carried At Cost Main Valuation Techniques Assets Line Items |  |  |
Contributed To Consolidated Group Assets | 324,005,000,000 | 196,119,000,000 | 193,819,000,000
Level 3 Of Fair Value Hierarchy Member | Financial Assets At Amortised Cost Member | Central Banks [Member] |  |  |
Disclosure Of Fair Value Instruments Carried At Cost Main Valuation Techniques Assets Line Items |  |  |
Contributed To Consolidated Group Assets | 0 | 2,000,000 | 1,000,000
Level 3 Of Fair Value Hierarchy Member | Financial Assets At Amortised Cost Member | Loans And Advances To Credit Institutions [Member] |  |  |
Disclosure Of Fair Value Instruments Carried At Cost Main Valuation Techniques Assets Line Items |  |  |
Contributed To Consolidated Group Assets | 12,641,000,000 | 4,628,000,000 | 4,291,000,000
Level 3 Of Fair Value Hierarchy Member | Financial Assets At Amortised Cost Member | Customers [Member] |  |  |
Disclosure Of Fair Value Instruments Carried At Cost Main Valuation Techniques Assets Line Items |  |  |
Contributed To Consolidated Group Assets | 310,924,000,000 | 190,144,000,000 | 183,645,000,000
Level 3 Of Fair Value Hierarchy Member | Financial Assets At Amortised Cost Member | Debt Securities [Member] |  |  |
Disclosure Of Fair Value Instruments Carried At Cost Main Valuation Techniques Assets Line Items |  |  |
Contributed To Consolidated Group Assets | € 440,000,000 | € 1,345,000,000 | € 5,881,000,000
Valuation Techniques Used Liabilities | Financial Assets At Amortised Cost Member |  |  |
Disclosure Of Fair Value Instruments Carried At Cost Main Valuation Techniques Assets Line Items |  |  |
Financial Instruments Valuation Methods Assets | Present-value method (Discounted future cash flows) |  |
Inputs Used | Financial Assets At Amortised Cost Member | Central Banks [Member] |  |  |
Disclosure Of Fair Value Instruments Carried At Cost Main Valuation Techniques Assets Line Items |  |  |
MainInputsUsedInFinancialInstrumentsAssets | - Credit spread - Prepayment rates - Interest rate yield |  |
Inputs Used | Financial Assets At Amortised Cost Member | Loans And Advances To Credit Institutions [Member] |  |  |
Disclosure Of Fair Value Instruments Carried At Cost Main Valuation Techniques Assets Line Items |  |  |
MainInputsUsedInFinancialInstrumentsAssets | - Credit spread - Prepayment rates - Interest rate yield |  |
Inputs Used | Financial Assets At Amortised Cost Member | Customers [Member] |  |  |
Disclosure Of Fair Value Instruments Carried At Cost Main Valuation Techniques Assets Line Items |  |  |
MainInputsUsedInFinancialInstrumentsAssets | - Credit spread - Prepayment rates - Interest rate yield |  |
Inputs Used | Financial Assets At Amortised Cost Member | Debt Securities [Member] |  |  |
Disclosure Of Fair Value Instruments Carried At Cost Main Valuation Techniques Assets Line Items |  |  |
MainInputsUsedInFinancialInstrumentsAssets | - Credit spread - Interest rate yield |  |

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