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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
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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) |  |  |  |  |  |  |  |  |

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