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v3.26.1

Grupo Santander - Offshore entities (Details) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2025 employee branch subsidiary jurisdiction | Dec. 31, 2024 employee branch | Dec. 31, 2023 employee
Disclosure of detailed information about business combination [line items] |  |  |
Number of persons | employee | 198,403 | 206,753 | 212,764
Number of jurisdictions within EU's blacklist | jurisdiction | 11 |  |
Number of jurisdictions within EU's grey list | 11 |  |
Bermuda |  |  |
Disclosure of detailed information about business combination [line items] |  |  |
Number of subsidiaries tax resident in the UK, liquidated during period | subsidiary | 1 |  |
Guernsey |  |  |
Disclosure of detailed information about business combination [line items] |  |  |
Number of subsidiaries tax resident in the UK | subsidiary | 1 |  |
Off-shore entities |  |  |
Disclosure of detailed information about business combination [line items] |  |  |
Number of branches resident in off-shore territories | 3 | 3 |
Spanish legislation | Off-shore entities |  |  |
Disclosure of detailed information about business combination [line items] |  |  |
Number of branches resident in off-shore territories | 3 |  |
Spanish legislation | Off shore entities, branches |  |  |
Disclosure of detailed information about business combination [line items] |  |  |
Number of branches resident in off-shore territories | 3 |  |
Number of persons | employee | 147 |  |

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