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Grupo Santander - Accelerated placement of ordinary shares of Santander Bank Polska (Details) € / shares in Units, zł / shares in Units, € in Millions, zł in Millions | Dec. 31, 2025 € / shares | Dec. 02, 2025 shares | Sep. 13, 2024 PLN (zł) | Sep. 13, 2024 EUR (€) | Sep. 10, 2024 zł / shares shares | Sep. 09, 2024 | Dec. 31, 2024 € / shares | Sep. 10, 2024 € / shares | Dec. 31, 2023 € / shares | Dec. 31, 2022 € / shares
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Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |
Nominal value per share (in euro per share) | € / shares | € 0.50 |  |  |  |  |  | € 0.50 |  | € 0.50 | € 0.50
Santander Bank Polska S.A. |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |
Sale of ordinary shares in subsidiary (in shares) | shares |  | 3,576,626 |  |  | 5,320,000 |  |  |  |  |
Percentage of share capital |  | 3.50% |  |  | 5.20% |  |  | 5.20% |  |
Proceeds from changes in ownership interests in subsidiaries that do not result in loss of control |  |  | zł 2,463 | € 575 |  |  |  |  |  |
Ownership interest in subsidiary | 58.70% |  | 62.20% | 62.20% |  | 67.40% |  |  |  |
Santander Bank Polska S.A. | Other reserves |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |
Increase (decrease) through change in equity of subsidiaries, equity |  |  |  | € 158 |  |  |  |  |  |
Santander Bank Polska S.A. | Other comprehensive income |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |
Increase (decrease) through change in equity of subsidiaries, equity |  |  |  | 57 |  |  |  |  |  |
Santander Bank Polska S.A. | Non-controlling interest, other elements |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |
Increase (decrease) through change in equity of subsidiaries, equity |  |  |  | € 360 |  |  |  |  |  |
Santander Bank Polska S.A. | Ordinary shares |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |
Nominal value per share (in euro per share) | (per share) |  |  |  |  | zł 463 |  |  | € 108 |  |

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