Contingent liabilities, commitments and guarantees (Details) - GBP (£) £ in Millions |
6 Months Ended | |
|---|---|---|
Jun. 30, 2026 |
Dec. 31, 2025 |
|
| Contingent liabilities, commitments and guarantees [Line Items] | ||
| Estimated financial effect of contingent liabilities | £ 3,027 | £ 3,009 |
| Gross loan commitments | 169,331 | 157,574 |
| Capital commitments excluding investment property | ||
| Contingent liabilities, commitments and guarantees [Line Items] | ||
| Contractual capital commitments | 788 | 610 |
| Investment property | ||
| Contingent liabilities, commitments and guarantees [Line Items] | ||
| Contractual capital commitments | 382 | 312 |
| Maximum exposure | ||
| Contingent liabilities, commitments and guarantees [Line Items] | ||
| Irrevocable commitments and guarantees | 97,768 | £ 88,135 |
| Legal proceedings contingent liability | ||
| Contingent liabilities, commitments and guarantees [Line Items] | ||
| Increase in current tax liabilities | 980 | |
| Reduction in deferred tax asset | £ (270) |