Share-Based Payments - Summary of Charges in Income Statement in Respect of Equity-Settled Share-Based Payment Plans (Detail) - GBP (£) £ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
|
| Disclosure of terms and conditions of share-based payment arrangement [abstract] | |||
| Share-based payment charges | £ 39 | £ 44 | £ 40 |