Earnings per share - summary of reconciliation of earnings to headline earnings (Details) - GBP (£) £ in Millions |
6 Months Ended | |
|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
|
| Earnings per share [abstract] | ||
| Earnings | £ 3,162 | £ 4,490 |
| Effect of impairment of intangibles, property, plant and equipment, associates and held-for-sale assets (net of tax) | 173 | 68 |
| 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) | (40) | (17) |
| Effect of losses on disposal of businesses, non-current investments and brands (net of tax) | 12 | 0 |
| Effect of foreign exchange reclassification from reserves to the income statement | 130 | 0 |
| Issue of shares and change in shareholding of an associate | (1) | (2) |
| Gain on partial disposal of an associate and associated capital gains tax, including foreign exchange reclassified | 0 | (841) |
| Headline earnings | £ 3,436 | £ 3,698 |