Subordinated liabilities - Subordinated liabilities (Details) - GBP (£) £ in Millions |
6 Months Ended | 12 Months Ended |
|---|---|---|
Jun. 30, 2025 |
Dec. 31, 2024 |
|
| Disclosure of detailed information about borrowings [line items] | ||
| Opening balance as at 1 January | £ 41,875 | £ 35,903 |
| Issuances | 5,379 | 11,222 |
| Redemptions | (2,371) | (5,067) |
| Other | (1,662) | (183) |
| Closing balance | 43,221 | 41,875 |
| Total subordinated liabilities | 43,771 | 42,412 |
| At fair value | ||
| Disclosure of detailed information about borrowings [line items] | ||
| Opening balance as at 1 January | 537 | |
| Closing balance | £ 550 | £ 537 |