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Note 12 Financial assets at fair value through other comprehensive income debt securities (Details) - EUR (€)
Jun. 30, 2021
Dec. 31, 2020
Foreign values [Line Items]    
Equity instruments at fair value through other comprehensive income € 1,347,000,000 € 1,100,000,000
Issued in euros [Member]    
Foreign values [Line Items]    
Amortized cost debt securities avaiable for sale financial assets 25,905,000,000 30,811,000,000
Fair value debt securities available for sale financial assets 26,691,000,000 31,712,000,000
Issued in euros [Member] | Government agency debt securities [Member]    
Foreign values [Line Items]    
Amortized cost debt securities avaiable for sale financial assets 24,123,000,000 28,582,000,000
Fair value debt securities available for sale financial assets 24,827,000,000 29,367,000,000
Issued in euros [Member] | Central banks [Member]    
Foreign values [Line Items]    
Amortized cost debt securities avaiable for sale financial assets 0 0
Fair value debt securities available for sale financial assets 0 0
Issued in euros [Member] | Banks [Member]    
Foreign values [Line Items]    
Amortized cost debt securities avaiable for sale financial assets 1,149,000,000 1,363,000,000
Fair value debt securities available for sale financial assets 1,207,000,000 1,439,000,000
Issued in euros [Member] | Other issuers [Member]    
Foreign values [Line Items]    
Amortized cost debt securities avaiable for sale financial assets 633,000,000 867,000,000
Fair value debt securities available for sale financial assets 658,000,000 906,000,000
MEXICO    
Foreign values [Line Items]    
Amortized cost debt securities avaiable for sale financial assets 10,638,000,000 9,107,000,000
Fair value debt securities available for sale financial assets 10,502,000,000 9,395,000,000
MEXICO | Government agency debt securities [Member]    
Foreign values [Line Items]    
Amortized cost debt securities avaiable for sale financial assets 9,956,000,000 8,309,000,000
Fair value debt securities available for sale financial assets 9,813,000,000 8,579,000,000
MEXICO | Central banks [Member]    
Foreign values [Line Items]    
Amortized cost debt securities avaiable for sale financial assets 0 0
Fair value debt securities available for sale financial assets 0 0
MEXICO | Banks [Member]    
Foreign values [Line Items]    
Amortized cost debt securities avaiable for sale financial assets 122,000,000 113,000,000
Fair value debt securities available for sale financial assets 122,000,000 118,000,000
MEXICO | Other issuers [Member]    
Foreign values [Line Items]    
Amortized cost debt securities avaiable for sale financial assets 560,000,000 685,000,000
Fair value debt securities available for sale financial assets 567,000,000 698,000,000
UNITED STATES    
Foreign values [Line Items]    
Amortized cost debt securities avaiable for sale financial assets 5,733,000,000 4,642,000,000
Fair value debt securities available for sale financial assets 5,762,000,000 4,691,000,000
UNITED STATES | Government agency debt securities [Member]    
Foreign values [Line Items]    
Amortized cost debt securities avaiable for sale financial assets 3,552,000,000 2,307,000,000
Fair value debt securities available for sale financial assets 3,541,000,000 2,315,000,000
UNITED STATES | Banks [Member]    
Foreign values [Line Items]    
Amortized cost debt securities avaiable for sale financial assets 107,000,000 186,000,000
Fair value debt securities available for sale financial assets 109,000,000 188,000,000
UNITED STATES | Other issuers [Member]    
Foreign values [Line Items]    
Amortized cost debt securities avaiable for sale financial assets 2,074,000,000 2,149,000,000
Fair value debt securities available for sale financial assets 2,112,000,000 2,187,000,000
TURKEY    
Foreign values [Line Items]    
Amortized cost debt securities avaiable for sale financial assets 3,383,000,000 3,456,000,000
Fair value debt securities available for sale financial assets 3,332,000,000 3,473,000,000
TURKEY | Government agency debt securities [Member]    
Foreign values [Line Items]    
Amortized cost debt securities avaiable for sale financial assets 3,383,000,000 3,456,000,000
Fair value debt securities available for sale financial assets 3,332,000,000 3,473,000,000
TURKEY | Central banks [Member]    
Foreign values [Line Items]    
Amortized cost debt securities avaiable for sale financial assets 0 0
Fair value debt securities available for sale financial assets 0 0
TURKEY | Banks [Member]    
Foreign values [Line Items]    
Amortized cost debt securities avaiable for sale financial assets 0 0
Fair value debt securities available for sale financial assets 0 0
TURKEY | Other issuers [Member]    
Foreign values [Line Items]    
Amortized cost debt securities avaiable for sale financial assets 0 0
Fair value debt securities available for sale financial assets 0 0
Other Countries [Member]    
Foreign values [Line Items]    
Amortized cost debt securities avaiable for sale financial assets 25,028,000,000 18,340,000,000
Fair value debt securities available for sale financial assets 25,524,000,000 19,037,000,000
Other Countries [Member] | Government agency debt securities [Member]    
Foreign values [Line Items]    
Amortized cost debt securities avaiable for sale financial assets 16,626,000,000 10,458,000,000
Fair value debt securities available for sale financial assets 16,936,000,000 10,943,000,000
Other Countries [Member] | Central banks [Member]    
Foreign values [Line Items]    
Amortized cost debt securities avaiable for sale financial assets 1,955,000,000 1,599,000,000
Fair value debt securities available for sale financial assets 1,963,000,000 1,611,000,000
Other Countries [Member] | Banks [Member]    
Foreign values [Line Items]    
Amortized cost debt securities avaiable for sale financial assets 2,465,000,000 2,521,000,000
Fair value debt securities available for sale financial assets 2,556,000,000 2,629,000,000
Other Countries [Member] | Other issuers [Member]    
Foreign values [Line Items]    
Amortized cost debt securities avaiable for sale financial assets 3,983,000,000 3,762,000,000
Fair value debt securities available for sale financial assets 4,068,000,000 3,854,000,000
Total foreign [Member]    
Foreign values [Line Items]    
Amortized cost debt securities avaiable for sale financial assets 44,783,000,000 35,545,000,000
Fair value debt securities available for sale financial assets 45,119,000,000 36,596,000,000
Debt securties at fair value through other comprehensive income [Member]    
Foreign values [Line Items]    
Amortized cost debt securities avaiable for sale financial assets 70,688,000,000 66,356,000,000
Fair value debt securities available for sale financial assets € 71,811,000,000 € 68,308,000,000