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Nota 8 - Fair Value Instruments Carried At Cost - Main Valuation Techniques - Liabilities (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 Liabilities Line Items |  |  |
Liabilities | € 686,156,000,000 | € 642,812,000,000 | € 622,801,000,000
Level 2 Of Fair Value Hierarchy Member | Financial liabilities at amortized cost [Member] |  |  |
Disclosure Of Fair Value Instruments Carried At Cost Main Valuation Techniques Liabilities Line Items |  |  |
Liabilities | 255,278,000,000 | 289,599,000,000 | 269,128,000,000
Level 2 Of Fair Value Hierarchy Member | Financial liabilities at amortized cost [Member] | Central Banks [Member] |  |  |
Disclosure Of Fair Value Instruments Carried At Cost Main Valuation Techniques Liabilities Line Items |  |  |
Liabilities | 0 | 129,000,000 | 196,000,000
Level 2 Of Fair Value Hierarchy Member | Financial liabilities at amortized cost [Member] | Credit Institutions [Member] |  |  |
Disclosure Of Fair Value Instruments Carried At Cost Main Valuation Techniques Liabilities Line Items |  |  |
Liabilities | 22,914,000,000 | 21,575,000,000 | 22,281,000,000
Level 2 Of Fair Value Hierarchy Member | Financial liabilities at amortized cost [Member] | Customers [Member] |  |  |
Disclosure Of Fair Value Instruments Carried At Cost Main Valuation Techniques Liabilities Line Items |  |  |
Liabilities | 210,097,000,000 | 245,720,000,000 | 240,547,000,000
Level 2 Of Fair Value Hierarchy Member | Financial liabilities at amortized cost [Member] | Debt Securities Issued [Member] |  |  |
Disclosure Of Fair Value Instruments Carried At Cost Main Valuation Techniques Liabilities Line Items |  |  |
Liabilities | 14,413,000,000 | 14,194,000,000 | 6,104,000,000
Level 2 Of Fair Value Hierarchy Member | Financial liabilities at amortized cost [Member] | Other Financial Liabilities Domain [Member] |  |  |
Disclosure Of Fair Value Instruments Carried At Cost Main Valuation Techniques Liabilities Line Items |  |  |
Liabilities | 7,854,000,000 | 7,981,000,000 | 0
Level 3 Of Fair Value Hierarchy Member | Financial liabilities at amortized cost [Member] |  |  |
Disclosure Of Fair Value Instruments Carried At Cost Main Valuation Techniques Liabilities Line Items |  |  |
Liabilities | 144,889,000,000 | 159,082,000,000 | 182,948,000,000
Level 3 Of Fair Value Hierarchy Member | Financial liabilities at amortized cost [Member] | Central Banks [Member] |  |  |
Disclosure Of Fair Value Instruments Carried At Cost Main Valuation Techniques Liabilities Line Items |  |  |
Liabilities | 207,000,000 | 0 | 0
Level 3 Of Fair Value Hierarchy Member | Financial liabilities at amortized cost [Member] | Credit Institutions [Member] |  |  |
Disclosure Of Fair Value Instruments Carried At Cost Main Valuation Techniques Liabilities Line Items |  |  |
Liabilities | 4,633,000,000 | 6,831,000,000 | 9,852,000,000
Level 3 Of Fair Value Hierarchy Member | Financial liabilities at amortized cost [Member] | Customers [Member] |  |  |
Disclosure Of Fair Value Instruments Carried At Cost Main Valuation Techniques Liabilities Line Items |  |  |
Liabilities | 129,525,000,000 | 135,514,000,000 | 135,270,000,000
Level 3 Of Fair Value Hierarchy Member | Financial liabilities at amortized cost [Member] | Debt Securities Issued [Member] |  |  |
Disclosure Of Fair Value Instruments Carried At Cost Main Valuation Techniques Liabilities Line Items |  |  |
Liabilities | 4,848,000,000 | 11,133,000,000 | 25,096,000,000
Level 3 Of Fair Value Hierarchy Member | Financial liabilities at amortized cost [Member] | Other Financial Liabilities Domain [Member] |  |  |
Disclosure Of Fair Value Instruments Carried At Cost Main Valuation Techniques Liabilities Line Items |  |  |
Liabilities | € 5,676,000,000 | € 5,604,000,000 | € 12,730,000,000
Valuation Techniques Used Liabilities | Financial liabilities at amortized cost [Member] |  |  |
Disclosure Of Fair Value Instruments Carried At Cost Main Valuation Techniques Liabilities Line Items |  |  |
Financial Instruments Valuation Methods Liabilities | Present-value method (Discounted future cash flows) |  |
Principal Inputs Used Liabilities | Financial liabilities at amortized cost [Member] |  |  |
Disclosure Of Fair Value Instruments Carried At Cost Main Valuation Techniques Liabilities Line Items |  |  |
Main Inputs Used In Financial Instruments Liabilities | - Issuer´s credit risk - Prepayment rates - Interest rate yield |  |

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