Market Risk - Yield Curve Risk (Details) - GBP (£) £ in Millions |
6 Months Ended | 12 Months Ended |
|---|---|---|
Jun. 30, 2026 |
Dec. 31, 2025 |
|
| +100bps | ||
| Disclosure Of Sensitivity Limit Of Risk [line items] | ||
| NII sensitivity (reviewed) | £ 365 | £ 281 |
| -100bps | ||
| Disclosure Of Sensitivity Limit Of Risk [line items] | ||
| NII sensitivity (reviewed) | £ (256) | £ (195) |