Pensions and other post-retirement benefits - Disclosure of asset allocation strategy (Details) |
Mar. 31, 2026 |
|---|---|
| UK | Pensions | |
| Disclosure of fair value of plan assets [line items] | |
| Return-seeking assets | 19.00% |
| Liability-matching assets | 81.00% |
| US | Pensions | |
| Disclosure of fair value of plan assets [line items] | |
| Return-seeking assets | 30.00% |
| Liability-matching assets | 70.00% |
| US | Other post-retirement benefits | |
| Disclosure of fair value of plan assets [line items] | |
| Return-seeking assets | 26.00% |
| Liability-matching assets | 74.00% |