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Note 23 - Assets and Liabilities under reinsurance and insurance contracts. Mathematical Reserves (Details) - EUR (€)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Matematical Reserves Line Items      
INSURANCE OR REINSURANCE ASSETS € 306,000,000 € 341,000,000 € 366,000,000
Spain [Member] | Individual Insurance [Member]      
Matematical Reserves Line Items      
Mortality Table [1] GRMF 80-2, GKM 80 / GKMF 95, PASEM, GKMF 80/95, PERFM 2000 GRMF 80-2, GKMF 80/95. PASEM, PERMF 2000 GRMF 80-2, GKM 80 / GKMF 95 PERMF 2000 PASEM
Average Technical Interest Type [1] 0.25% -2.87% 0.25% -2.91% 0.26%-3.27%
Spain [Member] | Savings Insurance [Member]      
Matematical Reserves Line Items      
Mortality Table [2] PERFM 2000 PERMF 2000 PERMF 2000
Average Technical Interest Type [2] Depending on the related portfolio Depending on the related portfolio Depending on the related portfolio
Mexico [Member] | Individual Insurance [Member]      
Matematical Reserves Line Items      
Mortality Table [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] 2.5% 2.50% 2.50%
Mexico [Member] | Savings Insurance [Member]      
Matematical Reserves Line Items      
Mortality Table [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] 5.5% 5.50% 5.50%
[1]

(1) Provides coverage in the case of one or more of the following events: death and disability.

[2]

(2) Insurance policies purchased by companies (other than BBVA Group entities) on behalf of their employees.