Segmental analysis - Schedule of geographical analysis of non-current assets (Details) - GBP (£) £ in Millions |
Mar. 31, 2026 |
Mar. 31, 2025 |
Mar. 31, 2024 |
|---|---|---|---|
| Disclosure of other provisions [line items] | |||
| Non-current assets other than financial instruments and pension assets | £ 96,824 | £ 88,754 | £ 84,335 |
| Pensions and other post-retirement benefit assets | 2,507 | 2,489 | 2,407 |
| Financial and other investments | 842 | 798 | 880 |
| Derivative financial assets | 623 | 369 | 324 |
| Total non-current assets | 100,796 | 92,410 | 87,946 |
| UK | |||
| Disclosure of other provisions [line items] | |||
| Non-current assets other than financial instruments and pension assets | 47,551 | 42,623 | 40,065 |
| US | |||
| Disclosure of other provisions [line items] | |||
| Non-current assets other than financial instruments and pension assets | £ 49,273 | £ 46,131 | £ 44,270 |