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Note 29 Treasury shares (Details) - EUR (€)
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Components of equity treasury stock [Line Items]      
Treasury shares € 34,000,000 € 29,000,000 € 647,000,000
Number of treasury shares 4,386,625 5,485,414 127,633,399
Average purchases in euros € 9.89 € 7.18 € 4.96
Average selling price in Euros 9.89 7.14 4.99
Net gains or losses on transactions 10,000,000 1,000,000 9,000,000
Treasury shares € 66,000,000 € 34,000,000 € 29,000,000
Number of treasury shares 6,666,856 4,386,625 5,485,414
Treasury shares changes over the year [Line Items]      
Number of purchases of treasury shares € 154,564,499 € 301,882,728 € 598,457,024
Purchases of treasury shares in millions of euros 1,528,000,000 2,166,000,000 2,966,000,000
Number of sales and other changes in treasury shares (152,284,268) (302,981,517) (720,605,009)
Sale or issue of treasury shares (1,497,000,000) (2,161,000,000) (3,583,000,000)
Millions of euros [Member]      
Components of equity treasury stock [Line Items]      
Average purchases in euros 0 0 0
Average selling price in Euros 0 0 0
Held by BBVA [Member]      
Components of equity treasury stock [Line Items]      
Treasury shares € 3,000,000 € 3,000,000  
Number of treasury shares 0 0  
Treasury shares € 7,000,000 € 3,000,000 € 3,000,000
Number of treasury shares 410,370 0 0
Held by Corporación General Financiera S.A. [Member]      
Components of equity treasury stock [Line Items]      
Treasury shares € 31,000,000 € 26,000,000  
Number of treasury shares 4,354,004 5,454,516  
Treasury shares € 59,000,000 € 31,000,000 € 26,000,000
Number of treasury shares 6,256,486 4,354,004 5,454,516
Held by other subsidiaries [Member]      
Components of equity treasury stock [Line Items]      
Treasury shares € 0 € 0  
Number of treasury shares 32,621 30,898  
Treasury shares € 0 € 0 € 0
Number of treasury shares 0 32,621 30,898