Decommissioning and other provisions - Narrative (Details) - USD ($) $ in Billions |
12 Months Ended | |
|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
|
| Decommissioning and restoration | ||
| Disclosures Of Decommissioning And Other Provisions [Line Items] | ||
| Discount rate applied to provision | 4.50% | 4.50% |
| 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 | $ 0.9 | $ 0.9 |
| Onerous contracts | ||
| Disclosures Of Decommissioning And Other Provisions [Line Items] | ||
| Increase in provision due to decrease in discount rate assumption | $ 1.1 | $ 1.0 |