Financial liabilities designated at fair value - Disclosure of financial liabilities designated at fair value (Details) - GBP (£) £ in Millions |
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
|---|---|---|---|
| Disclosure of financial liabilities [line items] | |||
| Repurchase agreements and other similar secured borrowing | £ 18,651 | £ 29,397 | |
| Subordinated debt | 45,239 | 41,875 | £ 35,903 |
| Financial liabilities designated at fair value | 293,527 | 279,777 | |
| Contractual amount due on maturity | |||
| Disclosure of financial liabilities [line items] | |||
| Debt securities | 99,105 | 92,479 | |
| Deposits | 51,262 | 48,201 | |
| Repurchase agreements and other similar secured borrowing | 159,276 | 156,600 | |
| Subordinated debt | 967 | 957 | |
| Financial liabilities designated at fair value | 310,610 | 298,237 | |
| At fair value | |||
| Disclosure of financial liabilities [line items] | |||
| Debt securities | 85,086 | 76,833 | |
| Deposits | 48,997 | 46,383 | |
| Repurchase agreements and other similar secured borrowing | 158,857 | 156,024 | |
| Subordinated debt | 587 | 537 | |
| Financial liabilities designated at fair value | £ 293,527 | £ 279,777 |