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v3.26.1

Introduction, basis of presentation of the consolidated financial statements (consolidated annual accounts) and other information - Events after the reporting period (Details) $ / shares in Units, € in Millions, $ in Millions | Feb. 03, 2026 EUR (€) shares | Feb. 03, 2026 USD ($) $ / shares shares | Jan. 09, 2026 EUR (€) | Dec. 31, 2025 | Dec. 02, 2025 EUR (€) | May 05, 2025 EUR (€) | Sep. 13, 2024 | Sep. 09, 2024
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Major business combination [member] | Webster Financial Corporation |  |  |  |  |  |  |  |
Subsidiaries and joint ventures |  |  |  |  |  |  |  |
Consideration paid (received) | € 10,300 | $ 12,200 |  |  |  |  |  |
Portion of consideration paid (received) in cash per share | $ / shares |  | $ 48.75 |  |  |  |  |  |
Portion of consideration paid (received) in shares per share | shares | 2.0548 | 2.0548 |  |  |  |  |  |
Consideration (in USD per share) | $ / shares |  | $ 75 |  |  |  |  |  |
Santander Bank Polska S.A. |  |  |  |  |  |  |  |
Subsidiaries and joint ventures |  |  |  |  |  |  |  |
Consideration paid (received) |  |  |  |  | € (407) |  |  |
Ownership interest in subsidiary |  |  |  | 58.70% |  |  | 62.20% | 67.40%
Santander Bank Polska S.A. | Disposal of major subsidiary |  |  |  |  |  |  |  |
Subsidiaries and joint ventures |  |  |  |  |  |  |  |
Ownership interest in subsidiary |  |  | 9.70% |  |  |  |  |
Agreement For The Sale Of Santander Bank Polska S.A. | Santander Bank Polska S.A. |  |  |  |  |  |  |  |
Subsidiaries and joint ventures |  |  |  |  |  |  |  |
Sale of proportion of ownership interest in subsidiary |  |  | 49.00% |  |  |  |  |
Agreement For The Sale Of Santander Bank Polska S.A. | Santander Bank Polska S.A. | Disposal of major subsidiary |  |  |  |  |  |  |  |
Subsidiaries and joint ventures |  |  |  |  |  |  |  |
Sale of proportion of ownership interest in subsidiary |  |  | 49.00% |  |  |  |  |
Agreement For The Sale Of Santander Bank Polska S.A. | Santander Towarzystwo Funduszy Inwestycyjnych S.A. | Disposal of major subsidiary |  |  |  |  |  |  |  |
Subsidiaries and joint ventures |  |  |  |  |  |  |  |
Sale of proportion of ownership interest in subsidiary |  |  | 50.00% |  |  |  |  |
Agreement For The Sale Of Santander Bank Polska S.A. | Santander Towarzystwo Funduszy Inwestycyjnych S.A. And Santander Bank Polska S.A. |  |  |  |  |  |  |  |
Subsidiaries and joint ventures |  |  |  |  |  |  |  |
Consideration paid (received) |  |  |  |  |  | € (7,000) |  |
Agreement For The Sale Of Santander Bank Polska S.A. | Santander Towarzystwo Funduszy Inwestycyjnych S.A. And Santander Bank Polska S.A. | Disposal of major subsidiary |  |  |  |  |  |  |  |
Subsidiaries and joint ventures |  |  |  |  |  |  |  |
Consideration paid (received) |  |  | € (7,000) |  |  |  |  |
Gains (losses) on disposal of subsidiaries |  |  | € 1,900 |  |  |  |  |

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