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Note 13 - Financial assets at fair value through other comprehensive income debt securities by rating (Details) - EUR (€)
€ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
AAA [Member]      
Available for sale financial assets debt securities by rating [Line Items]      
Subtotal Debt securities, available-for-sale € 531 € 687 € 4,922
Percentage available for sale financial assets debt securities 1.00% 1.00% 6.60%
AA + [Member]      
Available for sale financial assets debt securities by rating [Line Items]      
Subtotal Debt securities, available-for-sale € 13,100 € 10,738 € 11,172
Percentage available for sale financial assets debt securities 24.40% 16.20% 15.00%
AA [Member]      
Available for sale financial assets debt securities by rating [Line Items]      
Subtotal Debt securities, available-for-sale € 222 € 507 € 594
Percentage available for sale financial assets debt securities 0.40% 0.80% 0.80%
AA - [Member]      
Available for sale financial assets debt securities by rating [Line Items]      
Subtotal Debt securities, available-for-sale € 409 € 291 € 575
Percentage available for sale financial assets debt securities 0.80% 0.40% 0.80%
A+ [Member]      
Available for sale financial assets debt securities by rating [Line Items]      
Subtotal Debt securities, available-for-sale € 632 € 664 € 1,230
Percentage available for sale financial assets debt securities 1.20% 1.00% 1.60%
A [Member]      
Available for sale financial assets debt securities by rating [Line Items]      
Subtotal Debt securities, available-for-sale € 687 € 683 € 7,442
Percentage available for sale financial assets debt securities 1.30% 1.00% 10.00%
A - [Member]      
Available for sale financial assets debt securities by rating [Line Items]      
Subtotal Debt securities, available-for-sale € 18,426 € 1,330 € 1,719
Percentage available for sale financial assets debt securities 34.30% 2.00% 2.30%
BBB + [Member]      
Available for sale financial assets debt securities by rating [Line Items]      
Subtotal Debt securities, available-for-sale € 9,195 € 35,175 € 29,569
Percentage available for sale financial assets debt securities 17.10% 53.10% 39.60%
BBB [Member]      
Available for sale financial assets debt securities by rating [Line Items]      
Subtotal Debt securities, available-for-sale € 4,607 € 7,958 € 3,233
Percentage available for sale financial assets debt securities 8.60% 12.00% 4.30%
BBB - [Member]      
Available for sale financial assets debt securities by rating [Line Items]      
Subtotal Debt securities, available-for-sale € 1,003 € 5,583 € 6,809
Percentage available for sale financial assets debt securities 1.90% 8.40% 9.10%
Bb [Member]      
Available for sale financial assets debt securities by rating [Line Items]      
Subtotal Debt securities, available-for-sale € 4,453 € 1,564 € 2,055
Percentage available for sale financial assets debt securities 8.30% 2.40% 2.80%
Without Rating [Member]      
Available for sale financial assets debt securities by rating [Line Items]      
Subtotal Debt securities, available-for-sale € 445 € 1,071 € 5,261
Percentage available for sale financial assets debt securities 0.80% 1.60% 7.10%
Total Exposures [Member]      
Available for sale financial assets debt securities by rating [Line Items]      
Subtotal Debt securities, available-for-sale € 53,709 € 66,251 € 74,580
Percentage available for sale financial assets debt securities 100.00% 100.00% 100.00%