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Note 19 - Tax assets and liabilities - Secured tax assets (Details) - EUR (€) € in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Pensions [Member] |  |  |
Secured Tax Assets Line Items |  |  |
Secured Tax Assets, broken down | € 1,897 | € 1,901 | € 1,904
Impairment Losses [Member] |  |  |
Secured Tax Assets Line Items |  |  |
Secured Tax Assets, broken down | 7,536 | 7,530 | 7,632
Total [Member] |  |  |
Secured Tax Assets Line Items |  |  |
Secured Tax Assets, broken down | € 9,433 | € 9,431 | € 9,536

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

X
- Definition The amount of deferred tax assets that are secured by the Government. + References No definition available. + Details
Name: | bbva_Securedtaxassetsofdeferredtaxes
Namespace Prefix: | bbva_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | bbva_TypeofsecuredtaxassetsAxis=bbva_PensionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | bbva_TypeofsecuredtaxassetsAxis=bbva_ImpairmentlossesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | bbva_TypeofsecuredtaxassetsAxis=bbva_TotalMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |