Pensions and other post-retirement benefits - Disclosure of asset allocation strategy (Details) |
Mar. 31, 2024 |
|---|---|
| UK | Pensions | |
| Disclosure of fair value of plan assets [line items] | |
| Return-seeking assets | 22.00% |
| Liability-matching assets | 78.00% |
| US | Pensions | |
| Disclosure of fair value of plan assets [line items] | |
| Return-seeking assets | 40.00% |
| Liability-matching assets | 60.00% |
| US | Other post-retirement benefits | |
| Disclosure of fair value of plan assets [line items] | |
| Return-seeking assets | 31.00% |
| Liability-matching assets | 69.00% |