Earnings per share - summary of reconciliation of earnings used to calculate earnings per share (Details) - GBP (£) £ in Millions |
6 Months Ended | |
|---|---|---|
Jun. 30, 2025 |
Jun. 30, 2024 |
|
| Earnings per share [abstract] | ||
| Earnings attributable to owners of the parent | £ 4,512 | £ 4,492 |
| Coupon on perpetual hybrid bonds | (29) | (28) |
| Tax on coupon on perpetual hybrid bonds | 7 | 7 |
| Earnings | £ 4,490 | £ 4,471 |