Earnings per share - summary of reconciliation of earnings to headline earnings (Details) - GBP (£) £ in Millions |
6 Months Ended | |
|---|---|---|
Jun. 30, 2025 |
Jun. 30, 2024 |
|
| Earnings per share [abstract] | ||
| Earnings | £ 4,490 | £ 4,471 |
| Effect of impairment of intangibles, property, plant and equipment, associates and held-for-sale assets (net of tax) | 68 | 373 |
| Effect of gains on disposal of property, plant and equipment, trademarks, held-for-sale assets, partial/full termination of IFRS 16 leases, and sale and leaseback (net of tax) | (17) | (31) |
| Issue of shares and change in shareholding of an associate | (2) | (6) |
| Gain on partial disposal of an associate and associated capital gains tax, including foreign exchange recycled | (841) | (1,307) |
| Headline earnings | £ 3,698 | £ 3,500 |