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Note 6 expected loss variation (Details)
 6 Months Ended
Jun. 30, 2021
Bbva group [Member] | Total portfolio [Member]  
Basic point [Line Items]  
GDP -100 bp 3.32% [1]
GDP plus100 bp (3.07%) [1]
Bbva group [Member] | Retail [Member]  
Basic point [Line Items]  
GDP -100 bp 3.15% [1]
GDP plus100 bp (2.90%) [1]
Bbva group [Member] | Mortgages [member]  
Basic point [Line Items]  
GDP -100 bp 3.41% [1]
GDP plus100 bp (2.92%) [1]
Bbva group [Member] | Wholesaler [Member]  
Basic point [Line Items]  
GDP -100 bp 4.28% [1]
GDP plus100 bp (4.01%) [1]
Bbva group [Member] | Fixed income [Member]  
Basic point [Line Items]  
GDP -100 bp 1.73% [1]
GDP plus100 bp (1.73%) [1]
SPAIN | Total portfolio [Member]  
Basic point [Line Items]  
GDP -100 bp 3.32% [1]
GDP plus100 bp (3.06%) [1]
SPAIN | Mortgages [member]  
Basic point [Line Items]  
GDP -100 bp 4.03% [1]
GDP plus100 bp (3.35%) [1]
Housing price -100 bp 5.17% [1]
Housing prince +100 pb (5.11%) [1]
SPAIN | Companies [Member]  
Basic point [Line Items]  
GDP -100 bp 4.16% [1]
GDP plus100 bp (3.97%) [1]
Housing price -100 bp 0.78% [1]
Housing prince +100 pb (0.77%) [1]
MEXICO | Total portfolio [Member]  
Basic point [Line Items]  
GDP -100 bp 3.73% [1]
GDP plus100 bp (3.56%) [1]
MEXICO | Mortgages [member]  
Basic point [Line Items]  
GDP -100 bp 2.06% [1]
GDP plus100 bp (1.96%) [1]
Housing price -100 bp 3.66% [1]
Housing prince +100 pb (3.43%) [1]
MEXICO | Cards [Member]  
Basic point [Line Items]  
GDP -100 bp 6.57% [1]
GDP plus100 bp (6.07%) [1]
TURKEY | Total portfolio [Member]  
Basic point [Line Items]  
GDP -100 bp 1.56% [1]
GDP plus100 bp (1.47%) [1]
TURKEY | Mortgages [member]  
Basic point [Line Items]  
GDP -100 bp 1.58% [1]
GDP plus100 bp (1.55%) [1]
TURKEY | Cards [Member]  
Basic point [Line Items]  
GDP -100 bp 1.62%
GDP plus100 bp (1.47%)
[1] (*) Last available data as of May 31, 2021, and from Turkey as of December 31, 2020.