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 |