Employee information - Additional Information (Detail) - GBP (£) £ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
|
| Disclosure of number of employees [line items] | |||
| Expense from share-based payment transactions with employees | £ 39 | £ 42 | £ 37 |
| Business combinations [member] | |||
| Disclosure of number of employees [line items] | |||
| Expense from share-based payment transactions with employees | £ 0 | £ 2 | £ 3 |