Borrowings - Narrative (Details) - GBP (£) £ in Millions |
Mar. 31, 2026 |
Mar. 31, 2025 |
Mar. 31, 2024 |
|---|---|---|---|
| Disclosure of fair value measurement of liabilities [line items] | |||
| Borrowings | £ 46,755 | £ 47,539 | £ 47,072 |
| Collateral received | 47 | 49 | |
| Borrowings | |||
| Disclosure of fair value measurement of liabilities [line items] | |||
| Notional amount | 46,113 | 46,739 | |
| At fair value | |||
| Disclosure of fair value measurement of liabilities [line items] | |||
| Borrowings | 42,505 | 43,137 | |
| At fair value | Level 1 | |||
| Disclosure of fair value measurement of liabilities [line items] | |||
| Borrowings | 35,727 | 34,639 | |
| At fair value | Level 2 | |||
| Disclosure of fair value measurement of liabilities [line items] | |||
| Borrowings | £ 6,778 | £ 8,498 |