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Grupo Santander - Agreement for the sale of the stake in Caceis (Details) - EUR (€) € in Millions |  | 12 Months Ended
--- | --- | ---
Dec. 19, 2024 | Dec. 31, 2025
Crédit Agricole S.A. | Caceis (Notes 3 and 12) |  |
Disclosure of detailed information about business combination [line items] |  |
Ownership interest in subsidiary | 100.00% |
Caceis (Notes 3 and 12) |  |
Disclosure of detailed information about business combination [line items] |  |
Proportion of ownership interest in associate, sold (in percentage) | 30.50% |
Gains (losses) on noncurrent assets held for sale not classified as discontinued operations |  | € 231

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