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Distribution of Banco Santander's profit, shareholder remuneration scheme and earnings per share - Narrative (Details) € / shares in Units, € in Millions |  |  |  |  | 1 Months Ended | 5 Months Ended | 11 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 24, 2026 € / shares | Jan. 09, 2026 | May 02, 2025 € / shares | Apr. 04, 2025 EUR (€) | Nov. 30, 2025 € / shares | Dec. 31, 2025 EUR (€) | Dec. 31, 2026 EUR (€) | Dec. 31, 2025 EUR (€) program
Profit Distribution [Line Items] |  |  |  |  |  |  |  |
Share buyback program, percentage of underlying profit |  |  |  |  |  |  | 25.00% | 25.00%
Number of share buyback programs | program |  |  |  |  |  |  |  | 2
Percentage of capital released of sale of Poland |  |  |  |  |  |  | 50.00% |
Agreement For The Sale Of Santander Bank Polska S.A. | Santander Bank Polska S.A. |  |  |  |  |  |  |  |
Profit Distribution [Line Items] |  |  |  |  |  |  |  |
Sale of proportion of ownership interest in subsidiary |  | 49.00% |  |  |  |  |  |
2024 Program, First |  |  |  |  |  |  |  |
Profit Distribution [Line Items] |  |  |  |  |  |  |  |
Share buyback program, amount |  |  |  | € 1,525 |  |  |  |
2024 Program, Second |  |  |  |  |  |  |  |
Profit Distribution [Line Items] |  |  |  |  |  |  |  |
Share buyback program, amount |  |  |  | € 1,587 |  |  |  |
2025 Program, First |  |  |  |  |  |  |  |
Profit Distribution [Line Items] |  |  |  |  |  |  |  |
Share buyback program, amount |  |  |  |  |  | € 1,700 |  |
2025 Program, Second |  |  |  |  |  |  |  |
Profit Distribution [Line Items] |  |  |  |  |  |  |  |
Share buyback program, amount |  |  |  |  |  |  | € 5,030 |
2025 And 2026 Program |  |  |  |  |  |  |  |
Profit Distribution [Line Items] |  |  |  |  |  |  |  |
Share buyback program, amount |  |  |  |  |  |  |  | € 10,000
2025 Program, Second, Capital Released Of Poland Sale |  |  |  |  |  |  |  |
Profit Distribution [Line Items] |  |  |  |  |  |  |  |
Share buyback program, amount |  |  |  |  |  |  | 3,200 |
2025 Program, Second, Group Underlying Profit |  |  |  |  |  |  |  |
Profit Distribution [Line Items] |  |  |  |  |  |  |  |
Share buyback program, amount |  |  |  |  |  |  | € 1,830 |
Interim dividend |  |  |  |  |  |  |  |
Profit Distribution [Line Items] |  |  |  |  |  |  |  |
Dividends per share (in eur per share) | € / shares |  |  |  |  | € 0.115 |  |  |
Complementary dividend |  |  |  |  |  |  |  |
Profit Distribution [Line Items] |  |  |  |  |  |  |  |
Dividends per share (in eur per share) | € / shares |  |  | € 0.11 |  |  |  |  |
Dividends proposed, total per share (in eur per share) | € / shares | € 0.125 |  |  |  |  |  |  |

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