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Note 8 - Fair Value - Financial Instruments At Fair Value By Levels - Liabilities (Details) - EUR (€)
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Fair Value Measurement Of Liabilities Line Items      
Liabilities € 686,156,000,000 € 642,812,000,000 € 622,801,000,000
Financial Liabilities Held For Trading [Member] | Level 1 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Liabilities Line Items      
Liabilities 27,587,000,000 26,266,000,000 22,932,000,000
Financial Liabilities Held For Trading [Member] | Level 2 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Liabilities Line Items      
Liabilities 58,045,000,000 61,588,000,000 56,560,000,000
Financial Liabilities Held For Trading [Member] | Level 3 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Liabilities Line Items      
Liabilities 856,000,000 827,000,000 269,000,000
Financial Liabilities Held For Trading [Member] | Derivatives [Member] | Level 1 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Liabilities Line Items      
Liabilities 7,402,000,000 4,425,000,000 3,919,000,000
Financial Liabilities Held For Trading [Member] | Derivatives [Member] | Level 2 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Liabilities Line Items      
Liabilities 34,046,000,000 29,466,000,000 26,615,000,000
Financial Liabilities Held For Trading [Member] | Derivatives [Member] | Level 3 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Liabilities Line Items      
Liabilities 232,000,000 175,000,000 267,000,000
Financial Liabilities Held For Trading [Member] | Deposits [Member] | Level 1 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Liabilities Line Items      
Liabilities 8,381,000,000 9,595,000,000 7,989,000,000
Financial Liabilities Held For Trading [Member] | Deposits [Member] | Level 2 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Liabilities Line Items      
Liabilities 23,495,000,000 32,121,000,000 29,945,000,000
Financial Liabilities Held For Trading [Member] | Deposits [Member] | Level 3 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Liabilities Line Items      
Liabilities 621,000,000 649,000,000 0
Financial Liabilities Held For Trading [Member] | Other Financial Liabilities [Member] | Level 1 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Liabilities Line Items      
Liabilities 11,805,000,000 12,246,000,000 11,024,000,000
Financial Liabilities Held For Trading [Member] | Other Financial Liabilities [Member] | Level 2 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Liabilities Line Items      
Liabilities 504,000,000 1,000,000 0
Financial Liabilities Held For Trading [Member] | Other Financial Liabilities [Member] | Level 3 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Liabilities Line Items      
Liabilities 3,000,000 2,000,000 1,000,000
Financial liabilities designated at fair value throuh profit or loss [Member] | Level 1 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Liabilities Line Items      
Liabilities 0 0 0
Financial liabilities designated at fair value throuh profit or loss [Member] | Level 2 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Liabilities Line Items      
Liabilities 8,558,000,000 8,629,000,000 3,149,000,000
Financial liabilities designated at fair value throuh profit or loss [Member] | Level 3 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Liabilities Line Items      
Liabilities 1,492,000,000 1,382,000,000 3,844,000,000
Financial liabilities designated at fair value throuh profit or loss [Member] | Deposits [Member] | Level 1 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Liabilities Line Items      
Liabilities 0 0 0
Financial liabilities designated at fair value throuh profit or loss [Member] | Deposits [Member] | Level 2 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Liabilities Line Items      
Liabilities 902,000,000 944,000,000 976,000,000
Financial liabilities designated at fair value throuh profit or loss [Member] | Deposits [Member] | Level 3 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Liabilities Line Items      
Liabilities 0 0 0
Financial liabilities designated at fair value throuh profit or loss [Member] | Other Financial Liabilities [Member] | Level 1 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Liabilities Line Items      
Liabilities 0 0 0
Financial liabilities designated at fair value throuh profit or loss [Member] | Other Financial Liabilities [Member] | Level 2 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Liabilities Line Items      
Liabilities 4,617,000,000 4,410,000,000 643,000,000
Financial liabilities designated at fair value throuh profit or loss [Member] | Other Financial Liabilities [Member] | Level 3 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Liabilities Line Items      
Liabilities 0 0 2,515,000,000
Financial liabilities designated at fair value throuh profit or loss [Member] | Debt Certificates [Member] | Level 1 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Liabilities Line Items      
Liabilities [1] 0 0 0
Financial liabilities designated at fair value throuh profit or loss [Member] | Debt Certificates [Member] | Level 2 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Liabilities Line Items      
Liabilities [1] 3,038,000,000 3,274,000,000 1,529,000,000
Financial liabilities designated at fair value throuh profit or loss [Member] | Debt Certificates [Member] | Level 3 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Liabilities Line Items      
Liabilities [1] 1,492,000,000 1,382,000,000 1,329,000,000
Derivatives Hedge accounting [Member] | Level 1 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Liabilities Line Items      
Liabilities 53,000,000 30,000,000 223,000,000
Derivatives Hedge accounting [Member] | Level 2 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Liabilities Line Items      
Liabilities 2,250,000,000 2,192,000,000 2,454,000,000
Derivatives Hedge accounting [Member] | Level 3 Of Fair Value Hierarchy Member      
Disclosure Of Fair Value Measurement Of Liabilities Line Items      
Liabilities € 15,000,000 € 11,000,000 € 3,000,000
[1]

(*) The information for the years 2019 and 2018 has been subject to certain modifications, related to some issuances of Garanti Group