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v3.26.1

Staff costs - Narrative (Details) | 12 Months Ended
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Dec. 31, 2025 people employee £ / shares | Dec. 31, 2024 employee people £ / shares | Dec. 31, 2023 people employee £ / shares | Dec. 31, 2008 GBP (£) trading_session
Share-based payment arrangement |  |  |  |
Total number of employees | employee | 198,403 | 206,753 | 212,764 |
Average number of employees | people | 203,572 | 209,371 | 211,135 |
Average number of employees with disabilities | 4,854 | 4,828 | 4,701 |
Weighted average grant-date fair value of options granted (in GBP per share) | £ / shares | £ 0.44 | £ 0.23 | £ 0.33 |
Spain |  |  |  |
Share-based payment arrangement |  |  |  |
Employee with disabilities, threshold degree of disability | 33.00% |  |  |
Banco Santander, S.A. |  |  |  |
Share-based payment arrangement |  |  |  |
Average number of employees | people | 23,207 | 23,839 | 24,061 |
Executive directors and Senior management |  |  |  |
Share-based payment arrangement |  |  |  |
Average number of employees | people | 17 | 15 | 16 |
Deferred variable compensation plan linked to multiannual objectives |  |  |  |
Share-based payment arrangement |  |  |  |
Fair value of plan, initial achievement | 70.00% |  |  |
Santander UK plc | Sharesave plan |  |  |  |
Share-based payment arrangement |  |  |  |
Percentage employees may reduce the average purchase and sale prices of shares under the Sharesave Scheme |  |  |  | 20.00%
Number of trading sessions | trading_session |  |  |  | 3
Minimum | Santander UK plc | Sharesave plan |  |  |  |
Share-based payment arrangement |  |  |  |
Employee contributions deducted from their net monthly pay | £ |  |  |  | £ 5
Period of time the employee contributions are deducted from their net monthly pay for the voluntary Sharesave Scheme |  |  |  | 3 years
Period for approval of the sharesave scheme by UK tax authorities |  |  |  | 21 days
Maximum | Santander UK plc | Sharesave plan |  |  |  |
Share-based payment arrangement |  |  |  |
Employee contributions deducted from their net monthly pay | £ |  |  |  | £ 500
Period of time the employee contributions are deducted from their net monthly pay for the voluntary Sharesave Scheme |  |  |  | 5 years
Period for approval of the sharesave scheme by UK tax authorities |  |  |  | 41 days
Banco Santander, S.A. |  |  |  |
Share-based payment arrangement |  |  |  |
Average number of employees with disabilities | employee | 419 | 435 | 428 |
Employee with disabilities, threshold degree of disability | 33.00% |  |  |
Number of employees with disabilities at end of period | employee | 413 | 432 | 436 |

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