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Note 12 - Financial assets at fair value through other comprehensive income debt securities (Details) - EUR (€)
Jun. 30, 2020
Dec. 31, 2019
Issued in Euros [Member] | States And Political Subdivisions [Member]    
Available for sale financial assets debt securities [Line Items]    
Amortized cost debt securities available for sale financial assets € 28,151,000,000 € 20,740,000,000
Fair Value Debt Securities Available For Sale Financial Assets 28,913,000,000 21,550,000,000
Issued in Euros [Member] | Central Banks [Member]    
Available for sale financial assets debt securities [Line Items]    
Amortized cost debt securities available for sale financial assets 0 0
Fair Value Debt Securities Available For Sale Financial Assets 0 0
Issued in Euros [Member] | Credit Institutions [Member]    
Available for sale financial assets debt securities [Line Items]    
Amortized cost debt securities available for sale financial assets 1,050,000,000 959,000,000
Fair Value Debt Securities Available For Sale Financial Assets 1,110,000,000 1,024,000,000
Issued in Euros [Member] | Other Issuers [Member]    
Available for sale financial assets debt securities [Line Items]    
Amortized cost debt securities available for sale financial assets 899,000,000 907,000,000
Fair Value Debt Securities Available For Sale Financial Assets 936,000,000 947,000,000
Total domestic [Member]    
Available for sale financial assets debt securities [Line Items]    
Amortized cost debt securities available for sale financial assets 30,100,000,000 22,607,000,000
Fair Value Debt Securities Available For Sale Financial Assets 30,959,000,000 23,521,000,000
Mexico [Member]    
Available for sale financial assets debt securities [Line Items]    
Amortized cost debt securities available for sale financial assets 7,224,000,000 7,790,000,000
Fair Value Debt Securities Available For Sale Financial Assets 7,375,000,000 7,786,000,000
Mexico [Member] | States And Political Subdivisions [Member]    
Available for sale financial assets debt securities [Line Items]    
Amortized cost debt securities available for sale financial assets 6,359,000,000 6,869,000,000
Fair Value Debt Securities Available For Sale Financial Assets 6,527,000,000 6,868,000,000
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
Fair Value Debt Securities Available For Sale Financial Assets 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 62,000,000 77,000,000
Fair Value Debt Securities Available For Sale Financial Assets 63,000,000 78,000,000
Mexico [Member] | Other Issuers [Member]    
Available for sale financial assets debt securities [Line Items]    
Amortized cost debt securities available for sale financial assets 803,000,000 843,000,000
Fair Value Debt Securities Available For Sale Financial Assets 786,000,000 840,000,000
United States [Member]    
Available for sale financial assets debt securities [Line Items]    
Amortized cost debt securities available for sale financial assets 10,267,000,000 11,376,000,000
Fair Value Debt Securities Available For Sale Financial Assets 10,421,000,000 11,393,000,000
United States [Member] | General Government [Member]    
Available for sale financial assets debt securities [Line Items]    
Amortized cost debt securities available for sale financial assets 6,572,000,000 8,570,000,000
Fair Value Debt Securities Available For Sale Financial Assets 6,698,000,000 8,599,000,000
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 4,049,000,000 5,595,000,000
Fair Value Debt Securities Available For Sale Financial Assets 4,113,000,000 5,624,000,000
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 2,523,000,000 2,975,000,000
Fair Value Debt Securities Available For Sale Financial Assets 2,585,000,000 2,975,000,000
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
Fair Value Debt Securities Available For Sale Financial Assets 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 157,000,000 122,000,000
Fair Value Debt Securities Available For Sale Financial Assets 158,000,000 124,000,000
United States [Member] | Other Issuers [Member]    
Available for sale financial assets debt securities [Line Items]    
Amortized cost debt securities available for sale financial assets 3,538,000,000 2,684,000,000
Fair Value Debt Securities Available For Sale Financial Assets 3,565,000,000 2,670,000,000
Turkey [Member]    
Available for sale financial assets debt securities [Line Items]    
Amortized cost debt securities available for sale financial assets 3,801,000,000 3,752,000,000
Fair Value Debt Securities Available For Sale Financial Assets 3,840,000,000 3,713,000,000
Turkey [Member] | States And Political Subdivisions [Member]    
Available for sale financial assets debt securities [Line Items]    
Amortized cost debt securities available for sale financial assets   3,752,000,000
Fair Value Debt Securities Available For Sale Financial Assets   3,713,000,000
Turkey [Member] | Central Banks [Member]    
Available for sale financial assets debt securities [Line Items]    
Amortized cost debt securities available for sale financial assets   0
Fair Value Debt Securities Available For Sale Financial Assets   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
Fair Value Debt Securities Available For Sale Financial Assets   0
Turkey [Member] | Other Issuers [Member]    
Available for sale financial assets debt securities [Line Items]    
Amortized cost debt securities available for sale financial assets   0
Fair Value Debt Securities Available For Sale Financial Assets   0
Other countries [Member]    
Available for sale financial assets debt securities [Line Items]    
Amortized cost debt securities available for sale financial assets 15,143,000,000 11,870,000,000
Fair Value Debt Securities Available For Sale Financial Assets 15,628,000,000 12,318,000,000
Other countries [Member] | States And Political Subdivisions [Member]    
Available for sale financial assets debt securities [Line Items]    
Amortized cost debt securities available for sale financial assets 7,519,000,000 6,963,000,000
Fair Value Debt Securities Available For Sale Financial Assets 7,861,000,000 7,269,000,000
Other countries [Member] | Central Banks [Member]    
Available for sale financial assets debt securities [Line Items]    
Amortized cost debt securities available for sale financial assets 1,481,000,000 1,005,000,000
Fair Value Debt Securities Available For Sale Financial Assets 1,484,000,000 1,010,000,000
Other countries [Member] | Credit Institutions [Member]    
Available for sale financial assets debt securities [Line Items]    
Amortized cost debt securities available for sale financial assets 2,425,000,000 1,795,000,000
Fair Value Debt Securities Available For Sale Financial Assets 2,517,000,000 1,892,000,000
Other countries [Member] | Other Issuers [Member]    
Available for sale financial assets debt securities [Line Items]    
Amortized cost debt securities available for sale financial assets 3,717,000,000 2,106,000,000
Fair Value Debt Securities Available For Sale Financial Assets 3,766,000,000 2,147,000,000
Total foreign [Member]    
Available for sale financial assets debt securities [Line Items]    
Amortized cost debt securities available for sale financial assets 36,436,000,000 34,788,000,000
Fair Value Debt Securities Available For Sale Financial Assets 37,264,000,000 35,210,000,000
Total Domestic Foreign [Member]    
Available for sale financial assets debt securities [Line Items]    
Amortized cost debt securities available for sale financial assets 66,536,000,000 57,395,000,000
Fair Value Debt Securities Available For Sale Financial Assets € 68,223,000,000 € 58,731,000,000