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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
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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%

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