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Note 19 - Tax assets and liabilities - Changes in the Nominal Tax Rate (Details) | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Chile [Member] |  |
Changes in the Nominal Tax Rate Line Items |  |
Applicable tax rate | 25,5% | 24,00%
Peru [Member] |  |
Changes in the Nominal Tax Rate Line Items |  |
Applicable tax rate | 29,5% | 28,0%

X
- Definition The Applicable tax rate percentage. + References No definition available. + Details
Name: | bbva_Applicabletaxratepercentage
Namespace Prefix: | bbva_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

X
- Details
Name: | bbva_ChangesintaxrateAxis=bbva_ChileMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | bbva_ChangesintaxrateAxis=bbva_PerumemberMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |