Financial assets at fair value through the income statement - Disclosure of credit risk of loans and advances designated at fair value and related credit derivatives (Details) - GBP (£) £ in Millions |
12 Months Ended | |
|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
|
| Credit risk | Derivative financial instruments | ||
| Disclosure of financial assets [line items] | ||
| Value mitigated by related credit derivatives, maximum exposure | £ 193 | £ 405 |
| Changes in fair value during the year ended | (2) | 0 |
| Cumulative changes in fair value from inception | (2) | 0 |
| Loans and advances | ||
| Disclosure of financial assets [line items] | ||
| Loans and advances designated at fair value, attributable to credit risk, maximum exposure | 785 | 1,039 |
| Changes in fair value during the year ended | 2 | (2) |
| Cumulative changes in fair value from inception | £ (2) | £ (4) |