Disposal of assets and other transactions (Details) - USD ($) $ in Millions |
Jun. 30, 2026 |
Dec. 31, 2025 |
|---|---|---|
| Assets classified as held for sale | ||
| Property, plant and equipment | $ 27 | $ 25 |
| Total | 27 | 25 |
| Liabilities on assets classified as held for sale | ||
| Provision for decommissioning costs | 112 | 103 |
| Total | 112 | $ 103 |
| Exploration And Production Segment [Member] | ||
| Assets classified as held for sale | ||
| Property, plant and equipment | 27 | |
| Total | 27 | |
| Liabilities on assets classified as held for sale | ||
| Provision for decommissioning costs | 112 | |
| Total | $ 112 |