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Note 7 - Risk Management -Liquidity Risk - Loans to Stable Customer Deposits (LtSCD) (Details)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
LtSCD Line Items
Average LtSCD	106%	110%	113%
BBVA Eurozone [Member]
LtSCD Line Items
Average LtSCD	101%	108%	113%
BBVA Bancomer [Member]
LtSCD Line Items
Average LtSCD	114%	109%	113%
Compass [Member]
LtSCD Line Items
Average LtSCD	119%	109%	108%
Garanti Bank [Member]
LtSCD Line Items
Average LtSCD	110%	122%	124%
Other LMU [Member]
LtSCD Line Items
Average LtSCD	99%	108%	107%

X

- Definition

Percentage of the average LtSCD by LMU

+ References

No definition available.

+ Details

Name:	bbva_Averageltscd
Namespace Prefix:	bbva_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- 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_LmutypesaxisAxis=bbva_BbvaeurozoneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	bbva_LmutypesaxisAxis=bbva_BbvabancomerMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	bbva_LmutypesaxisAxis=bbva_BbvacompassMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	bbva_LmutypesaxisAxis=bbva_GarantibankmemberMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	bbva_LmutypesaxisAxis=bbva_OtherlmumemberMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: