Decommissioning and other provisions - Narrative (Details) - USD ($) $ in Millions |
12 Months Ended | |
|---|---|---|
Dec. 31, 2024 |
Dec. 31, 2023 |
|
| Disclosures Of Decommissioning And Other Provisions [Line Items] | ||
| Decrease through disposals and transfers to liabilities included in disposal groups classified as held for sale, other provisions | $ 3,105 | |
| Decommissioning and restoration | ||
| Disclosures Of Decommissioning And Other Provisions [Line Items] | ||
| Discount rate applied to provision | 4.50% | 4.50% |
| Decrease through transfer to liabilities included in disposal groups classified as held for sale, other provisions | $ 3,053 | |
| 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 | $ 900 |
| Onerous contracts | ||
| Disclosures Of Decommissioning And Other Provisions [Line Items] | ||
| Increase in provision due to decrease in discount rate assumption | $ 1,000 | $ 1,000 |