Property, plant and equipment - Summary of Capitalised Exploration Drilling Costs (Details) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2023 |
Dec. 31, 2022 |
Dec. 31, 2021 |
|
| Property, plant and equipment [abstract] | |||
| At January 1 | $ 2,911 | $ 3,015 | $ 3,654 |
| Additions pending determination of proved reserves | 1,967 | 1,298 | 1,024 |
| Amounts charged to expense | (868) | (881) | (639) |
| Reclassifications to productive wells on determination of proved reserves | (874) | (531) | (577) |
| Other movements | 0 | 10 | (447) |
| At December 31 | $ 3,136 | $ 2,911 | $ 3,015 |