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Note 28 - Retained earnings, revaluation reserves and other reserves - Reserves (Details) | 12 Months Ended
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Dec. 31, 2017
Retained earnings, revaluation reserves and other reserves Line Items |
Nature and purpose of reserves within equity | The legal reserve can be used to increase the common stock provided that the remaining reserve balance does not fall below 10% of the increased capital. While it does not exceed 20% of the common stock, it can only be allocated to offset losses exclusively in the case that there are not sufficient reserves available.

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- References No definition available. + Details
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Namespace Prefix: | bbva_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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Period Type: | duration