Contingent liabilities and commitments - Narrative (Details) - GBP (£) £ in Millions |
Dec. 31, 2025 |
Dec. 31, 2024 |
|---|---|---|
| Disclosure of contingent liabilities [line items] | ||
| Provisions | £ 766 | £ 736 |
| Expected credit losses held against contingent liabilities and commitments | ||
| Disclosure of contingent liabilities [line items] | ||
| Provisions | £ 398 | £ 420 |