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Note 26 - Common Stock - Other Capital Instruments (Details) € in Millions, $ in Billions | 1 Months Ended | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2017 | Dec. 31, 2017 | Nov. 14, 2017 EUR (€) | Mar. 24, 2017 EUR (€) | Apr. 30, 2016 USD ($) | Feb. 28, 2015 USD ($) | Feb. 28, 2014 USD ($) | Apr. 30, 2013 USD ($)
Other Capital Instruments Line Items |  |  |  |  |  |  |  |
Percentage of maximun nominal amount in terms of Equity, from now to five years |  | 20% |  |  |  |  |  |
Convertible Securities [Member] |  |  |  |  |  |  |  |
Other Capital Instruments Line Items |  |  |  |  |  |  |  |
Amount Issued |  |  | € 1,000 | € 500 | $ 1.0 | $ 1.5 | $ 1.5 | $ 1.5
Percentage of maximun nominal amount in terms of Equity | 20% |  |  |  |  |  |  |

X
- Definition The amount of liabilities issued. + References No definition available. + Details
Name: | bbva_Amountissued
Namespace Prefix: | bbva_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The maximun nominal amount to be issued. + References No definition available. + Details
Name: | bbva_Maximunnominalamount
Namespace Prefix: | bbva_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The maximun nominal amount to be issued from now to five years. + References No definition available. + Details
Name: | bbva_Maximunnominalamountfromnowtofiveyears
Namespace Prefix: | bbva_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

X
- Details
Name: | bbva_ClassesofsharecapitalothercapitalinstrumentsAxis=bbva_ConvertiblesecuritiesmemberMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |