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Distribution of Banco Santander's profit, shareholder remuneration scheme and earnings per share - Schedule of distribution of the Bank's net profit (Details) - EUR (€) |  |  | 1 Months Ended | 8 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Feb. 24, 2026 | May 02, 2025 | Nov. 30, 2025 | Aug. 31, 2025 | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Profit Distribution [Line Items] |  |  |  |  |  |  |
Dividends paid in cash |  |  |  | € 0 | € 4,237,000,000 | € 3,677,000,000 | € 3,009,000,000
Profit or loss for the year |  |  |  |  | 15,500,000,000 | € 13,744,000,000 | € 12,183,000,000
Interim dividend |  |  |  |  |  |  |
Profit Distribution [Line Items] |  |  |  |  |  |  |
Dividends per share (in eur per share) |  |  | € 0.115 |  |  |  |
Complementary dividend |  |  |  |  |  |  |
Profit Distribution [Line Items] |  |  |  |  |  |  |
Dividends per share (in eur per share) |  | € 0.11 |  |  |  |  |
Dividends proposed, total per share (in eur per share) | € 0.125 |  |  |  |  |  |
Banco Santander, S.A. |  |  |  |  |  |  |
Profit Distribution [Line Items] |  |  |  |  |  |  |
Dividends paid in cash |  |  |  |  | 3,520,000,000 |  |
To voluntary reserves |  |  |  |  | 7,593,000,000 |  |
Profit or loss for the year |  |  |  |  | € 11,113,000,000 |  |
Number of shares outstanding, entitled to receive dividend |  |  |  |  | 14,568,470,446 |  |
Banco Santander, S.A. | Interim dividend |  |  |  |  |  |  |
Profit Distribution [Line Items] |  |  |  |  |  |  |
Dividends paid in cash |  |  |  |  | € 1,699,000,000 |  |
Dividends per share (in eur per share) |  |  |  |  | € 0.115 |  |
Banco Santander, S.A. | Complementary dividend |  |  |  |  |  |  |
Profit Distribution [Line Items] |  |  |  |  |  |  |
Dividends paid in cash |  |  |  |  | € 1,821,058,805.75 |  |
Dividends proposed, total per share (in eur per share) |  |  |  |  | € 0.125 |  |

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