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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
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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%

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