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Note 18 - Intangible assets - Acquisition of Garanti Bank Share Capital (Details) | 12 Months Ended
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Dec. 31, 2017
Garanti Bank [Member] |
Acquisition of additional equity capital Line Items |
Percentage Voting Equity Interests Acquired | 14.89%
Catalunya Bank [Member] |
Acquisition of additional equity capital Line Items |
Percentage Voting Equity Interests Acquired | 98.4%

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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 The percentage of voting equity interests acquired. + References No definition available. + Details
Name: | bbva_Percentagevotingequityinterestsacquired
Namespace Prefix: | bbva_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | bbva_GarantibankacquisitionAxis=bbva_GarantibankmemberMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | bbva_GarantibankacquisitionAxis=bbva_CatalunyabankmemberMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |