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Note 13 - Loans and receivables - Reclassified to Loans and Receivables from "Available-for-sale" financial assets (Details) - EUR (€) € in Millions | Dec. 31, 2017 | Dec. 31, 2016
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BBVA, S.A. [Member] |  |
Debt securities reclassified to loans and receivables from available for sale financial assets |  |
Carrying Amount reclassified to "loans and receivables" from Available for Sale | € 715 | € 844
Fair Value reclassified to "loans and receivables" from Available for Sale | 735 | 863
BBVA, S.A. [Member] | Reclasification Date [Member] |  |
Debt securities reclassified to loans and receivables from available for sale financial assets |  |
Carrying Amount reclassified to "loans and receivables" from Available for Sale | 862 |
Fair Value reclassified to "loans and receivables" from Available for Sale | 862 |
Subtotal [Member] |  |
Debt securities reclassified to loans and receivables from available for sale financial assets |  |
Carrying Amount reclassified to "loans and receivables" from Available for Sale | 715 | 844
Fair Value reclassified to "loans and receivables" from Available for Sale | 735 | € 863
Subtotal [Member] | Reclasification Date [Member] |  |
Debt securities reclassified to loans and receivables from available for sale financial assets |  |
Carrying Amount reclassified to "loans and receivables" from Available for Sale | 862 |
Fair Value reclassified to "loans and receivables" from Available for Sale | € 862 |

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