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Note 12 - Available for sale Financial Assets - Available for sale financial assets debt securities by rating (Details) - EUR (€) € in Millions | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
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Available for sale financial assets debt securities by rating [Line Items] |  |  |
Fair Value | € 66,251 | € 74,580 | € 108,310
AAA [Member] |  |  |
Available for sale financial assets debt securities by rating [Line Items] |  |  |
Fair Value | € 687 | € 4,922 | € 1,842
Percentage available for sale financial assets debt securities | 1.00% | 6.60% | 1.70%
AA + [Member] |  |  |
Available for sale financial assets debt securities by rating [Line Items] |  |  |
Fair Value | € 10,738 | € 11,172 | € 10,372
Percentage available for sale financial assets debt securities | 16.20% | 15.00% | 9.60%
AA [Member] |  |  |
Available for sale financial assets debt securities by rating [Line Items] |  |  |
Fair Value | € 507 | € 594 | € 990
Percentage available for sale financial assets debt securities | 0.80% | 0.80% | 0.90%
AA - [Member] |  |  |
Available for sale financial assets debt securities by rating [Line Items] |  |  |
Fair Value | € 291 | € 575 | € 938
Percentage available for sale financial assets debt securities | 0.40% | 0.80% | 0.90%
A+ [Member] |  |  |
Available for sale financial assets debt securities by rating [Line Items] |  |  |
Fair Value | € 664 | € 1,230 | € 1,686
Percentage available for sale financial assets debt securities | 1.00% | 1.60% | 1.60%
A [Member] |  |  |
Available for sale financial assets debt securities by rating [Line Items] |  |  |
Fair Value | € 683 | € 7,442 | € 994
Percentage available for sale financial assets debt securities | 1.00% | 10.00% | 0.90%
A - [Member] |  |  |
Available for sale financial assets debt securities by rating [Line Items] |  |  |
Fair Value | € 1,330 | € 1,719 | € 4,826
Percentage available for sale financial assets debt securities | 2.00% | 2.30% | 4.50%
BBB + [Member] |  |  |
Available for sale financial assets debt securities by rating [Line Items] |  |  |
Fair Value | € 35,175 | € 29,569 | € 51,885
Percentage available for sale financial assets debt securities | 53.10% | 39.60% | 47.90%
BBB [Member] |  |  |
Available for sale financial assets debt securities by rating [Line Items] |  |  |
Fair Value | € 7,958 | € 3,233 | € 23,728
Percentage available for sale financial assets debt securities | 12.00% | 4.30% | 21.90%
BBB - [Member] |  |  |
Available for sale financial assets debt securities by rating [Line Items] |  |  |
Fair Value | € 5,583 | € 6,809 | € 5,621
Percentage available for sale financial assets debt securities | 8.40% | 9.10% | 5.20%
Bb [Member] |  |  |
Available for sale financial assets debt securities by rating [Line Items] |  |  |
Fair Value | € 1,564 | € 2,055 | € 2,639
Percentage available for sale financial assets debt securities | 2.40% | 2.80% | 2.40%
Without Rating [Member] |  |  |
Available for sale financial assets debt securities by rating [Line Items] |  |  |
Fair Value | € 1,071 | € 5,261 | € 2,789
Percentage available for sale financial assets debt securities | 1.60% | 7.10% | 2.60%
Total Exposures [Member] |  |  |
Available for sale financial assets debt securities by rating [Line Items] |  |  |
Fair Value | € 66,251 | € 74,580 | € 108,310
Percentage available for sale financial assets debt securities | 100.00% | 100.00% | 100.00%

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