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Distribution of Banco Santander's profit, shareholder remuneration scheme and earnings per share - Schedule of provisional accounting statement for interim dividend (Details) - EUR (€) € in Millions | 8 Months Ended | 12 Months Ended
--- | --- | ---
Aug. 31, 2025 | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Shareholder Remuneration System And Earnings Per Share [Abstract] |  |  |  |
Profit before taxes | € 6,193.0 | € 18,681.0 | € 17,347.0 | € 15,005.0
Continuing operations | 635.0 | 4,723.0 | 4,844.0 | 3,880.0
Dividends paid in cash | 0.0 | 4,237.0 | 3,677.0 | 3,009.0
Distributable maximum amount | 5,558.0 |  |  |
Cash, cash balances at central banks and other deposits on demand | € 96,923.0 | € 152,281.0 | € 192,208.0 | € 220,342.0

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