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Note 12 - Financial assets at fair value through other comprehensive income debt securities by rating (Details) - EUR (€) € in Millions | Jun. 30, 2018 | Dec. 31, 2017
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AAA [Member] |  |
Available for sale financial assets debt securities by rating [Line Items] |  |
Subtotal Debt securities, available-for-sale | € 606 | € 687
Percentage available for sale financial assets debt securities | 1.00% | 1.00%
AA + [Member] |  |
Available for sale financial assets debt securities by rating [Line Items] |  |
Subtotal Debt securities, available-for-sale | € 12,331 | € 10,738
Percentage available for sale financial assets debt securities | 20.30% | 16.20%
AA [Member] |  |
Available for sale financial assets debt securities by rating [Line Items] |  |
Subtotal Debt securities, available-for-sale | € 223 | € 507
Percentage available for sale financial assets debt securities | 0.40% | 0.80%
AA - [Member] |  |
Available for sale financial assets debt securities by rating [Line Items] |  |
Subtotal Debt securities, available-for-sale | € 486 | € 291
Percentage available for sale financial assets debt securities | 0.80% | 0.40%
A+ [Member] |  |
Available for sale financial assets debt securities by rating [Line Items] |  |
Subtotal Debt securities, available-for-sale | € 777 | € 664
Percentage available for sale financial assets debt securities | 1.30% | 1.00%
A [Member] |  |
Available for sale financial assets debt securities by rating [Line Items] |  |
Subtotal Debt securities, available-for-sale | € 786 | € 683
Percentage available for sale financial assets debt securities | 1.30% | 1.00%
A - [Member] |  |
Available for sale financial assets debt securities by rating [Line Items] |  |
Subtotal Debt securities, available-for-sale | € 22,676 | € 1,330
Percentage available for sale financial assets debt securities | 37.40% | 2.00%
BBB + [Member] |  |
Available for sale financial assets debt securities by rating [Line Items] |  |
Subtotal Debt securities, available-for-sale | € 9,858 | € 35,175
Percentage available for sale financial assets debt securities | 16.30% | 53.10%
BBB [Member] |  |
Available for sale financial assets debt securities by rating [Line Items] |  |
Subtotal Debt securities, available-for-sale | € 6,972 | € 7,958
Percentage available for sale financial assets debt securities | 11.50% | 12.00%
BBB - [Member] |  |
Available for sale financial assets debt securities by rating [Line Items] |  |
Subtotal Debt securities, available-for-sale | € 3,458 | € 5,583
Percentage available for sale financial assets debt securities | 5.70% | 8.40%
Bb [Member] |  |
Available for sale financial assets debt securities by rating [Line Items] |  |
Subtotal Debt securities, available-for-sale | € 836 | € 1,564
Percentage available for sale financial assets debt securities | 1.40% | 2.40%
Without Rating [Member] |  |
Available for sale financial assets debt securities by rating [Line Items] |  |
Subtotal Debt securities, available-for-sale | € 1,589 | € 1,071
Percentage available for sale financial assets debt securities | 2.60% | 1.60%
Total Exposures [Member] |  |
Available for sale financial assets debt securities by rating [Line Items] |  |
Subtotal Debt securities, available-for-sale | € 60,600 | € 66,251
Percentage available for sale financial assets debt securities | 100.00% | 100.00%

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