Financial instruments - Disclosure of net value of unsettled positions for derivative forward contracts and swaps (Details) - USD ($) $ in Millions |
Jun. 30, 2026 |
Dec. 31, 2025 |
|---|---|---|
| Financial Instruments [Abstract] | ||
| Unrealized gains in Other current assets | $ 15 | $ 5 |
| Unrealized losses in Current financial debts | (3) | (6) |
| Net value of unsettled positions for derivatives contracts | $ 12 | $ (1) |