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Note 29 - Treasury Shares Treasury Stock - Treasury Stock (Details) | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Bottom Of Range Member |  |  |
Treasury Stock Line Items |  |  |
Percentage Treasury Stock | 0.008% | 0.138% | 0.20%
Top Of Range [Member] |  |  |
Treasury Stock Line Items |  |  |
Percentage Treasury Stock | 0.464% | 0.746% | 0.85%
Closing range [Member] |  |  |
Treasury Stock Line Items |  |  |
Percentage Treasury Stock | 0.215% | 0.213% | 0.709%

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- References No definition available. + Details
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Namespace Prefix: | bbva_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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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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- Details
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Namespace Prefix: |
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Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |