Borrowing facilities - Narrative (Details) - GBP (£) £ in Millions |
Jun. 03, 2026 |
Mar. 31, 2026 |
Mar. 31, 2025 |
|---|---|---|---|
| Disclosure of detailed information about borrowings [line items] | |||
| Undrawn borrowing facilities | £ 8,007 | £ 7,832 | |
| In 1 to 2 years | |||
| Disclosure of detailed information about borrowings [line items] | |||
| Undrawn borrowing facilities | 5,408 | 0 | |
| In 1 to 2 years | Extension of term of borrowing facilities | |||
| Disclosure of detailed information about borrowings [line items] | |||
| Undrawn borrowing facilities | £ 5,158 | ||
| Facilities held as backup to commercial paper and similar borrowings | |||
| Disclosure of detailed information about borrowings [line items] | |||
| Undrawn borrowing facilities | 7,968 | 7,792 | |
| Facilities available as backup to specific US borrowings | |||
| Disclosure of detailed information about borrowings [line items] | |||
| Undrawn borrowing facilities | £ 39 | £ 40 |