Other reserves - Other reserves (Details) - GBP (£) £ in Millions |
Jun. 30, 2026 |
Dec. 31, 2025 |
|---|---|---|
| Disclosure of reserves within equity [line items] | ||
| Other reserves | £ 1,493 | £ 1,628 |
| Currency translation reserve | ||
| Disclosure of reserves within equity [line items] | ||
| Other reserves | 2,712 | 2,493 |
| Fair value through other comprehensive income reserve | ||
| Disclosure of reserves within equity [line items] | ||
| Other reserves | (1,000) | (1,100) |
| Cash flow hedging reserve | ||
| Disclosure of reserves within equity [line items] | ||
| Other reserves | (1,548) | (666) |
| Own credit reserve | ||
| Disclosure of reserves within equity [line items] | ||
| Other reserves | (652) | (990) |
| Other reserves and treasury shares | ||
| Disclosure of reserves within equity [line items] | ||
| Other reserves | £ 1,981 | £ 1,891 |