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Note 7 - Risk Management - Guaranteed financial instruments based on IFRS9 (Details) - EUR (€) | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
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Maximun Credit Risk Exposure [Member] |  |  |
Impaired Financial Assets At Amortised Cost Line Items |  |  |
Impaired Financial Assets At Amortised Cost | € 14,678,000,000 | € 15,959,000,000 | € 16,359,000,000
of which guaranteed [Member] | Residential Mortgage [Member] |  |  |
Impaired Financial Assets At Amortised Cost Line Items |  |  |
Impaired Financial Assets At Amortised Cost | 2,717,000,000 | 3,396,000,000 | 3,484,000,000
of which guaranteed [Member] | Commerce Mortgage [Member] |  |  |
Impaired Financial Assets At Amortised Cost Line Items |  |  |
Impaired Financial Assets At Amortised Cost | 789,000,000 | 939,000,000 | 1,255,000,000
of which guaranteed [Member] | Cash [Member] |  |  |
Impaired Financial Assets At Amortised Cost Line Items |  |  |
Impaired Financial Assets At Amortised Cost | 18,000,000 | 35,000,000 | 13,000,000
of which guaranteed [Member] | Other [Member] |  |  |
Impaired Financial Assets At Amortised Cost Line Items |  |  |
Impaired Financial Assets At Amortised Cost | 52,000,000 | 221,000,000 | 317,000,000
of which guaranteed [Member] | Funds [Member] |  |  |
Impaired Financial Assets At Amortised Cost Line Items |  |  |
Impaired Financial Assets At Amortised Cost | € 575,000,000 | € 542,000,000 | € 502,000,000

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- Definition The amount of impaired financial assets the entity has, classified at amortized cost + References No definition available. + Details
Name: | bbva_Impairedfinancialassetsatamortisedcost
Namespace Prefix: | bbva_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
Name: | bbva_ImpairedfinancialassetsatamortisedcostLineItems
Namespace Prefix: | bbva_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | bbva_SecuredfinancialinstrumentsaxisAxis=bbva_MaximuncreditriskexposureMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | bbva_SecuredfinancialinstrumentsaxisAxis=bbva_OfwhichguaranteedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | bbva_GuaranteedsecuredfinancialinstrumentsaxisAxis=bbva_ResidentialmortgageMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | bbva_GuaranteedsecuredfinancialinstrumentsaxisAxis=bbva_CommercemortgageMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | bbva_GuaranteedsecuredfinancialinstrumentsaxisAxis=bbva_CashMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | bbva_GuaranteedsecuredfinancialinstrumentsaxisAxis=bbva_OtherMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | bbva_GuaranteedsecuredfinancialinstrumentsaxisAxis=bbva_FundsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |