Decommissioning and other provisions - Narrative (Details) - USD ($) $ in Millions |
12 Months Ended | |
|---|---|---|
Dec. 31, 2023 |
Dec. 31, 2022 |
|
| Disclosure of other provisions [line items] | ||
| (Decrease) increase in provision as a result of the change in discount rate | $ 2,916 | |
| Decommissioning and restoration | ||
| Disclosure of other provisions [line items] | ||
| Discount rate applied to provision | 4.50% | 3.25% |
| Percentage increase in discount rate assumption | 0.50% | |
| Percentage decrease in discount rate assumption | 0.50% | |
| Decrease in provision due to increase in discount rate assumption | $ 900 | $ 1,200 |
| (Decrease) increase in provision as a result of the change in discount rate | 2,777 | |
| Increase (decrease) in provision as a result of the changes in cost estimates | 1,340 | |
| Onerous contracts provision | ||
| Disclosure of other provisions [line items] | ||
| Increase in provision due to decrease in discount rate assumption | $ 1,000 | $ 1,300 |