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Note 13 - Financial assets at fair value through other comprehensive income debt securities (Details) - EUR (€)
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Total domestic [Member] | Total Member      
Available for sale financial assets debt securities [Line Items]      
Amortized cost debt securities available for sale financial assets € 30,811,000,000 € 22,607,000,000 € 18,802,000,000
Unrealized Gains debt securities available for sale financial assets 917,000,000 935,000,000 761,000,000
Unrealized losses debt securities available for sale financial assets (17,000,000) (21,000,000) (10,000,000)
FairValueDebtSecuritiesAvailableForSaleFinancialAssets 31,712,000,000 23,521,000,000 19,553,000,000
Total domestic [Member] | General Government [Member]      
Available for sale financial assets debt securities [Line Items]      
Amortized cost debt securities available for sale financial assets 28,582,000,000 20,740,000,000 17,205,000,000
Unrealized Gains debt securities available for sale financial assets 801,000,000 830,000,000 661,000,000
Unrealized losses debt securities available for sale financial assets (16,000,000) (20,000,000) (9,000,000)
FairValueDebtSecuritiesAvailableForSaleFinancialAssets 29,367,000,000 21,550,000,000 17,857,000,000
Total domestic [Member] | Central Banks [Member]      
Available for sale financial assets debt securities [Line Items]      
Amortized cost debt securities available for sale financial assets 0 0 0
Unrealized Gains debt securities available for sale financial assets 0 0 0
Unrealized losses debt securities available for sale financial assets 0 0 0
FairValueDebtSecuritiesAvailableForSaleFinancialAssets 0 0 0
Total domestic [Member] | Credit Institutions [Member]      
Available for sale financial assets debt securities [Line Items]      
Amortized cost debt securities available for sale financial assets 1,363,000,000 959,000,000 793,000,000
Unrealized Gains debt securities available for sale financial assets 76,000,000 65,000,000 63,000,000
Unrealized losses debt securities available for sale financial assets 0 0 0
FairValueDebtSecuritiesAvailableForSaleFinancialAssets 1,439,000,000 1,024,000,000 855,000,000
Total domestic [Member] | Other Issuers [Member]      
Available for sale financial assets debt securities [Line Items]      
Amortized cost debt securities available for sale financial assets 867,000,000 907,000,000 804,000,000
Unrealized Gains debt securities available for sale financial assets 40,000,000 40,000,000 37,000,000
Unrealized losses debt securities available for sale financial assets (1,000,000) 0 (1,000,000)
FairValueDebtSecuritiesAvailableForSaleFinancialAssets 906,000,000 947,000,000 841,000,000
Mexico [Member] | Total Member      
Available for sale financial assets debt securities [Line Items]      
Amortized cost debt securities available for sale financial assets 9,107,000,000 7,790,000,000 6,299,000,000
Unrealized Gains debt securities available for sale financial assets 291,000,000 22,000,000 6,000,000
Unrealized losses debt securities available for sale financial assets (3,000,000) (26,000,000) (142,000,000)
FairValueDebtSecuritiesAvailableForSaleFinancialAssets 9,395,000,000 7,786,000,000 6,163,000,000
Mexico [Member] | General Government [Member]      
Available for sale financial assets debt securities [Line Items]      
Amortized cost debt securities available for sale financial assets 8,309,000,000 6,869,000,000 5,286,000,000
Unrealized Gains debt securities available for sale financial assets 271,000,000 18,000,000 4,000,000
Unrealized losses debt securities available for sale financial assets (1,000,000) (19,000,000) (121,000,000)
FairValueDebtSecuritiesAvailableForSaleFinancialAssets 8,579,000,000 6,868,000,000 5,169,000,000
Mexico [Member] | Central Banks [Member]      
Available for sale financial assets debt securities [Line Items]      
Amortized cost debt securities available for sale financial assets 0 0 0
Unrealized Gains debt securities available for sale financial assets 0 0 0
Unrealized losses debt securities available for sale financial assets 0 0 0
FairValueDebtSecuritiesAvailableForSaleFinancialAssets 0 0 0
Mexico [Member] | Credit Institutions [Member]      
Available for sale financial assets debt securities [Line Items]      
Amortized cost debt securities available for sale financial assets 113,000,000 77,000,000 35,000,000
Unrealized Gains debt securities available for sale financial assets 5,000,000 2,000,000 0
Unrealized losses debt securities available for sale financial assets 0 0 (1,000,000)
FairValueDebtSecuritiesAvailableForSaleFinancialAssets 118,000,000 78,000,000 34,000,000
Mexico [Member] | Other Issuers [Member]      
Available for sale financial assets debt securities [Line Items]      
Amortized cost debt securities available for sale financial assets 685,000,000 843,000,000 978,000,000
Unrealized Gains debt securities available for sale financial assets 15,000,000 2,000,000 2,000,000
Unrealized losses debt securities available for sale financial assets (2,000,000) (6,000,000) (20,000,000)
FairValueDebtSecuritiesAvailableForSaleFinancialAssets 698,000,000 840,000,000 961,000,000
United States [Member] | Total Member      
Available for sale financial assets debt securities [Line Items]      
Amortized cost debt securities available for sale financial assets 4,642,000,000 11,376,000,000 14,507,000,000
Unrealized Gains debt securities available for sale financial assets 52,000,000 68,000,000 47,000,000
Unrealized losses debt securities available for sale financial assets (3,000,000) (51,000,000) (217,000,000)
FairValueDebtSecuritiesAvailableForSaleFinancialAssets 4,691,000,000 11,393,000,000 14,338,000,000
United States [Member] | General Government [Member]      
Available for sale financial assets debt securities [Line Items]      
Amortized cost debt securities available for sale financial assets 2,307,000,000 8,570,000,000 11,227,000,000
Unrealized Gains debt securities available for sale financial assets 9,000,000 42,000,000 37,000,000
Unrealized losses debt securities available for sale financial assets (1,000,000) (12,000,000) (135,000,000)
FairValueDebtSecuritiesAvailableForSaleFinancialAssets 2,315,000,000 8,599,000,000 11,130,000,000
United States [Member] | Total State Debt [Member]      
Available for sale financial assets debt securities [Line Items]      
Amortized cost debt securities available for sale financial assets 2,307,000,000 5,595,000,000 7,285,000,000
Unrealized Gains debt securities available for sale financial assets 9,000,000 32,000,000 29,000,000
Unrealized losses debt securities available for sale financial assets (1,000,000) (2,000,000) (56,000,000)
FairValueDebtSecuritiesAvailableForSaleFinancialAssets 2,315,000,000 5,624,000,000 7,258,000,000
United States [Member] | States And Political Subdivisions [Member]      
Available for sale financial assets debt securities [Line Items]      
Amortized cost debt securities available for sale financial assets 0 2,975,000,000 3,942,000,000
Unrealized Gains debt securities available for sale financial assets 0 10,000,000 8,000,000
Unrealized losses debt securities available for sale financial assets 0 (10,000,000) (79,000,000)
FairValueDebtSecuritiesAvailableForSaleFinancialAssets 0 2,975,000,000 3,872,000,000
United States [Member] | Central Banks [Member]      
Available for sale financial assets debt securities [Line Items]      
Amortized cost debt securities available for sale financial assets 0 0 0
Unrealized Gains debt securities available for sale financial assets 0 0 0
Unrealized losses debt securities available for sale financial assets 0 0 0
FairValueDebtSecuritiesAvailableForSaleFinancialAssets 0 0 0
United States [Member] | Credit Institutions [Member]      
Available for sale financial assets debt securities [Line Items]      
Amortized cost debt securities available for sale financial assets 186,000,000 122,000,000 49,000,000
Unrealized Gains debt securities available for sale financial assets 3,000,000 2,000,000 1,000,000
Unrealized losses debt securities available for sale financial assets 0 0 0
FairValueDebtSecuritiesAvailableForSaleFinancialAssets 188,000,000 124,000,000 50,000,000
United States [Member] | Other Issuers [Member]      
Available for sale financial assets debt securities [Line Items]      
Amortized cost debt securities available for sale financial assets 2,149,000,000 2,684,000,000 3,231,000,000
Unrealized Gains debt securities available for sale financial assets 40,000,000 24,000,000 9,000,000
Unrealized losses debt securities available for sale financial assets (2,000,000) (39,000,000) (82,000,000)
FairValueDebtSecuritiesAvailableForSaleFinancialAssets 2,187,000,000 2,670,000,000 3,158,000,000
Turkey [Member] | Total Member      
Available for sale financial assets debt securities [Line Items]      
Amortized cost debt securities available for sale financial assets 3,456,000,000 3,752,000,000 4,164,000,000
Unrealized Gains debt securities available for sale financial assets 90,000,000 38,000,000 20,000,000
Unrealized losses debt securities available for sale financial assets (73,000,000) (76,000,000) (269,000,000)
FairValueDebtSecuritiesAvailableForSaleFinancialAssets 3,473,000,000 3,713,000,000 3,916,000,000
Turkey [Member] | General Government [Member]      
Available for sale financial assets debt securities [Line Items]      
Amortized cost debt securities available for sale financial assets 3,456,000,000 3,752,000,000 4,007,000,000
Unrealized Gains debt securities available for sale financial assets 90,000,000 38,000,000 20,000,000
Unrealized losses debt securities available for sale financial assets (73,000,000) (76,000,000) (256,000,000)
FairValueDebtSecuritiesAvailableForSaleFinancialAssets 3,473,000,000 3,713,000,000 3,771,000,000
Turkey [Member] | Central Banks [Member]      
Available for sale financial assets debt securities [Line Items]      
Amortized cost debt securities available for sale financial assets 0 0 0
Unrealized Gains debt securities available for sale financial assets 0 0 0
Unrealized losses debt securities available for sale financial assets 0 0 0
FairValueDebtSecuritiesAvailableForSaleFinancialAssets 0 0 0
Turkey [Member] | Credit Institutions [Member]      
Available for sale financial assets debt securities [Line Items]      
Amortized cost debt securities available for sale financial assets 0 0 157,000,000
Unrealized Gains debt securities available for sale financial assets 0 0 0
Unrealized losses debt securities available for sale financial assets 0 0 (13,000,000)
FairValueDebtSecuritiesAvailableForSaleFinancialAssets 0 0 145,000,000
Turkey [Member] | Other Issuers [Member]      
Available for sale financial assets debt securities [Line Items]      
Amortized cost debt securities available for sale financial assets 0 0 0
Unrealized Gains debt securities available for sale financial assets 0 0 0
Unrealized losses debt securities available for sale financial assets 0 0 0
FairValueDebtSecuritiesAvailableForSaleFinancialAssets 0 0 0
Other countries [Member] | Total Member      
Available for sale financial assets debt securities [Line Items]      
Amortized cost debt securities available for sale financial assets 18,340,000,000 11,870,000,000 9,551,000,000
Unrealized Gains debt securities available for sale financial assets 739,000,000 554,000,000 319,000,000
Unrealized losses debt securities available for sale financial assets (42,000,000) (106,000,000) (130,000,000)
FairValueDebtSecuritiesAvailableForSaleFinancialAssets 19,037,000,000 12,318,000,000 9,740,000,000
Other countries [Member] | General Government [Member]      
Available for sale financial assets debt securities [Line Items]      
Amortized cost debt securities available for sale financial assets 10,458,000,000 6,963,000,000 4,510,000,000
Unrealized Gains debt securities available for sale financial assets 502,000,000 383,000,000 173,000,000
Unrealized losses debt securities available for sale financial assets (17,000,000) (78,000,000) (82,000,000)
FairValueDebtSecuritiesAvailableForSaleFinancialAssets 10,943,000,000 7,269,000,000 4,601,000,000
Other countries [Member] | Central Banks [Member]      
Available for sale financial assets debt securities [Line Items]      
Amortized cost debt securities available for sale financial assets 1,599,000,000 1,005,000,000 987,000,000
Unrealized Gains debt securities available for sale financial assets 21,000,000 9,000,000 2,000,000
Unrealized losses debt securities available for sale financial assets (8,000,000) (4,000,000) (4,000,000)
FairValueDebtSecuritiesAvailableForSaleFinancialAssets 1,611,000,000 1,010,000,000 986,000,000
Other countries [Member] | Credit Institutions [Member]      
Available for sale financial assets debt securities [Line Items]      
Amortized cost debt securities available for sale financial assets 2,521,000,000 1,795,000,000 1,856,000,000
Unrealized Gains debt securities available for sale financial assets 116,000,000 109,000,000 111,000,000
Unrealized losses debt securities available for sale financial assets (8,000,000) (12,000,000) (20,000,000)
FairValueDebtSecuritiesAvailableForSaleFinancialAssets 2,629,000,000 1,892,000,000 1,947,000,000
Other countries [Member] | Other Issuers [Member]      
Available for sale financial assets debt securities [Line Items]      
Amortized cost debt securities available for sale financial assets 3,762,000,000 2,106,000,000 2,197,000,000
Unrealized Gains debt securities available for sale financial assets 100,000,000 53,000,000 33,000,000
Unrealized losses debt securities available for sale financial assets (8,000,000) (12,000,000) (25,000,000)
FairValueDebtSecuritiesAvailableForSaleFinancialAssets 3,854,000,000 2,147,000,000 2,206,000,000
Total foreign [Member]      
Available for sale financial assets debt securities [Line Items]      
Amortized cost debt securities available for sale financial assets 35,545,000,000 34,788,000,000 34,521,000,000
Unrealized Gains debt securities available for sale financial assets 1,172,000,000 681,000,000 392,000,000
Unrealized losses debt securities available for sale financial assets (120,000,000) (259,000,000) (758,000,000)
FairValueDebtSecuritiesAvailableForSaleFinancialAssets 36,596,000,000 35,210,000,000 34,157,000,000
Total Domestic Foreign [Member]      
Available for sale financial assets debt securities [Line Items]      
Amortized cost debt securities available for sale financial assets 66,356,000,000 57,395,000,000 53,323,000,000
Unrealized Gains debt securities available for sale financial assets 2,089,000,000 1,617,000,000 1,153,000,000
Unrealized losses debt securities available for sale financial assets (137,000,000) (280,000,000) (768,000,000)
FairValueDebtSecuritiesAvailableForSaleFinancialAssets € 68,308,000,000 € 58,731,000,000 € 53,709,000,000