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Note 23 Mathematical reserves (Details)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
6311 Life Insurance [Member] | SPAIN      
Mathematical reserves [Line Items]      
Mortality tables [1] GRMF 80-2, GKM 80 / GKMF 95, PASEM,GKMF 80/95,PERFM 2000 GRMF 80-2, GKM 80 / GKMF 95, PASEM,GKMF 80/95,PERFM 2000 GRMF 80-2, GKMF 80/95. PASEM, PERMF 2000
Average technical interest type [1] 0.24%- 2,85% 0.25%- 2,87 0.25%- 2.91%
6311 Life Insurance [Member] | MEXICO      
Mathematical reserves [Line Items]      
Mortality tables [1] Tables of the Comisión Nacional de Seguros y Fianzas 2000-individual Tables of the Comisión Nacional de Seguros y Fianzas 2000-individual Tables of the Comisión Nacional de Seguros y Fianzas 2000-individual
Average technical interest type [1] 3.60 2.50 2.50
Group insurance [Member] | SPAIN      
Mathematical reserves [Line Items]      
Mortality tables [2] PERFM 2000 PERFM 2000 PERMF 2000
Average technical interest type [2] Depending on the related portfolio Depending on the related portfolio Depending on the related portfolio
Group insurance [Member] | MEXICO      
Mathematical reserves [Line Items]      
Mortality tables [2] Tables of the Comisión Nacional de Seguros y Fianzas 2000-grupo Tables of the Comisión Nacional de Seguros y Fianzas 2000-grupo Tables of the Comisión Nacional de Seguros y Fianzas 2000-grupo
Average technical interest type [2] 5.50 5.50 5.50
[1] (*) Provides coverage in the case of one or more of the following events: death and disability.
[2] (**) Insurance policies purchased by companies (other than BBVA Group entities) on behalf of their employees.