v3.26.1
Grupo Santander - Agreement for the sale of Santander Bank Polska S.A. and accelerated placement of ordinary shares of Santander Bank Polska (Details)
zł / shares in Units, € in Millions, zł in Millions
Jan. 09, 2026
EUR (€)
Dec. 31, 2025
Dec. 23, 2025
EUR (€)
Dec. 23, 2025
PLN (zł)
Dec. 02, 2025
EUR (€)
shares
May 05, 2025
EUR (€)
Sep. 13, 2024
Sep. 10, 2024
shares
Sep. 09, 2024
May 05, 2025
zł / shares
Agreement For The Sale Of Santander Bank Polska S.A. | Santander Consumer S.A. | Santander Consumer Bank Polska                    
Disclosure of detailed information about business combination [line items]                    
Consideration paid (received)     € 726 zł 3,105            
Percentage of voting equity interests acquired     60.00% 60.00%            
Santander Bank Polska S.A.                    
Disclosure of detailed information about business combination [line items]                    
Proportion of ownership interest in subsidiary, announced for sale                   49.00%
Consideration paid (received)         € (407)          
Sale of ordinary shares in subsidiary (in shares) | shares         3,576,626     5,320,000    
Percentage of share capital         3.50%     5.20%    
Ownership interest in subsidiary   58.70%         62.20%   67.40%  
Santander Bank Polska S.A. | Agreement For The Sale Of Santander Bank Polska S.A.                    
Disclosure of detailed information about business combination [line items]                    
Proportion of ownership interest in subsidiary, announced for sale                   49.00%
Sale of interest held, price per share | zł / shares                   zł 584
Santander Towarzystwo Funduszy Inwestycyjnych S.A. | Agreement For The Sale Of Santander Bank Polska S.A.                    
Disclosure of detailed information about business combination [line items]                    
Proportion of ownership interest in subsidiary, announced for sale                   50.00%
Santander Towarzystwo Funduszy Inwestycyjnych S.A. And Santander Bank Polska S.A. | Agreement For The Sale Of Santander Bank Polska S.A.                    
Disclosure of detailed information about business combination [line items]                    
Consideration paid (received)           € (7,000)        
Disposal of major subsidiary | Santander Bank Polska S.A.                    
Disclosure of detailed information about business combination [line items]                    
Ownership interest in subsidiary 9.70%                  
Disposal of major subsidiary | Santander Towarzystwo Funduszy Inwestycyjnych S.A. And Santander Bank Polska S.A. | Agreement For The Sale Of Santander Bank Polska S.A.                    
Disclosure of detailed information about business combination [line items]                    
Consideration paid (received) € (7,000)