Employee benefits (Details 7) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
|
| Employee Benefits | |||
| Balance at beginning of the year | $ (30) | $ (200) | $ (107) |
| Effect of changes actuarial assumptions | (35) | 306 | (642) |
| Return on plan assets (excluding interest income) | (4) | (225) | 330 |
| Change of asset ceiling | 64 | 76 | 220 |
| Others | (5) | (7) | (12) |
| Total | 20 | 150 | (104) |
| Deferred income tax | (2) | (48) | 36 |
| Other comprehensive income | 18 | 102 | (68) |
| Translation adjustments | (16) | 68 | (25) |
| Accumulated other comprehensive income | $ (28) | $ (30) | $ (200) |