Assets held for sale, liabilities of disposal groups held for sale and business acquisitions - Assets and liabilities held for sale (Details) - USD ($) $ in Millions |
Dec. 31, 2025 |
Dec. 31, 2024 |
|---|---|---|
| Non-current Assets Held For Sale And Discontinued Operations [Abstract] | ||
| Disposal groups | $ 9,713 | $ 27,126 |
| Unallocated impairment losses | (93) | (31) |
| Non-current assets held for sale | 1,495 | 139 |
| Assets held for sale | 11,115 | 27,234 |
| Liabilities of disposal groups held for sale | $ 23,382 | $ 29,011 |