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Note 13 - Financial assets at fair value through other comprehensive income debt securities by rating (Details) - EUR (€)
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
AAA [Member]      
Available for sale financial assets debt securities by rating [Line Items]      
Subtotal Debt securities, available-for-sale € 4,345,000,000 € 3,669,000,000 € 531,000,000
Percentage available for sale financial assets debt securities 6.40% 6.20% 1.00%
AA + [Member]      
Available for sale financial assets debt securities by rating [Line Items]      
Subtotal Debt securities, available-for-sale € 595,000,000 € 7,279,000,000 € 13,100,000,000
Percentage available for sale financial assets debt securities 0.90% 12.40% 24.40%
AA [Member]      
Available for sale financial assets debt securities by rating [Line Items]      
Subtotal Debt securities, available-for-sale € 449,000,000 € 317,000,000 € 222,000,000
Percentage available for sale financial assets debt securities 0.70% 0.50% 0.40%
AA - [Member]      
Available for sale financial assets debt securities by rating [Line Items]      
Subtotal Debt securities, available-for-sale € 406,000,000 € 265,000,000 € 409,000,000
Percentage available for sale financial assets debt securities 0.60% 0.50% 0.80%
A+ [Member]      
Available for sale financial assets debt securities by rating [Line Items]      
Subtotal Debt securities, available-for-sale € 5,912,000,000 € 3,367,000,000 € 632,000,000
Percentage available for sale financial assets debt securities 8.70% 5.70% 1.20%
A [Member]      
Available for sale financial assets debt securities by rating [Line Items]      
Subtotal Debt securities, available-for-sale € 2,112,000,000 € 12,895,000,000 € 687,000,000
Percentage available for sale financial assets debt securities 3.10% 22.00% 1.30%
A - [Member]      
Available for sale financial assets debt securities by rating [Line Items]      
Subtotal Debt securities, available-for-sale € 31,614,000,000 € 10,947,000,000 € 18,426,000,000
Percentage available for sale financial assets debt securities 46.30% 18.60% 34.30%
BBB + [Member]      
Available for sale financial assets debt securities by rating [Line Items]      
Subtotal Debt securities, available-for-sale € 8,629,000,000 € 9,946,000,000 € 9,195,000,000
Percentage available for sale financial assets debt securities 12.60% 16.90% 17.10%
BBB [Member]      
Available for sale financial assets debt securities by rating [Line Items]      
Subtotal Debt securities, available-for-sale € 4,054,000,000 € 2,966,000,000 € 4,607,000,000
Percentage available for sale financial assets debt securities 5.90% 5.10% 8.60%
BBB - [Member]      
Available for sale financial assets debt securities by rating [Line Items]      
Subtotal Debt securities, available-for-sale € 5,116,000,000 € 1,927,000,000 € 1,003,000,000
Percentage available for sale financial assets debt securities 7.50% 3.30% 1.90%
Bb [Member]      
Available for sale financial assets debt securities by rating [Line Items]      
Subtotal Debt securities, available-for-sale € 4,731,000,000 € 4,712,000,000 € 4,453,000,000
Percentage available for sale financial assets debt securities 6.90% 8.00% 8.30%
Without Rating [Member]      
Available for sale financial assets debt securities by rating [Line Items]      
Subtotal Debt securities, available-for-sale € 345,000,000 € 441,000,000 € 445,000,000
Percentage available for sale financial assets debt securities 0.50% 0.80% 0.80%
Total Exposures [Member]      
Available for sale financial assets debt securities by rating [Line Items]      
Subtotal Debt securities, available-for-sale € 68,308,000,000 € 58,731,000,000 € 53,709,000,000
Percentage available for sale financial assets debt securities 100.00% 100.00% 100.00%