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Note 7 - Risk Management -Liquidity Risk - Loans to Stable Customer Deposits (LtSCD) (Details) | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
LtsCD Line Items |  |  |
Average LtSCD | 110.00% | 113.00% | 116.00%
BBVA Eurozone Member [Member] |  |  |
LtsCD Line Items |  |  |
Average LtSCD | 108.00% | 113.00% | 116.00%
BBVA Bancomer [Member] |  |  |
LtsCD Line Items |  |  |
Average LtSCD | 109.00% | 113.00% | 110.00%
BBVA Compass Member [Member] |  |  |
LtsCD Line Items |  |  |
Average LtSCD | 109.00% | 108.00% | 112.00%
Garanti Bank [Member] |  |  |
LtsCD Line Items |  |  |
Average LtSCD | 122.00% | 124.00% | 128.00%
Other LMU Member [Member] |  |  |
LtsCD Line Items |  |  |
Average LtSCD | 108.00% | 107.00% | 111.00%

X
- Definition The average of LtSCD (Loan-to-Stable Customer Deposits). + References No definition available. + Details
Name: | bbva_Averageltscd
Namespace Prefix: | bbva_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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

X
- Details
Name: | bbva_LtscbreakdownbycountryAxis=bbva_BbvaeurozonememebrMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | bbva_LtscbreakdownbycountryAxis=bbva_BbvabancomerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | bbva_LtscbreakdownbycountryAxis=bbva_BbvacompassmemberMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | bbva_LtscbreakdownbycountryAxis=bbva_OtherlmumemberMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |