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Capital structure and financing - C.2. Dividend distributions (Details) $ / shares in Units, $ in Millions |  |  |  |  |  |  |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 15, 2026 $ / shares | Jan. 15, 2026 $ / shares | Oct. 15, 2025 $ / shares | Aug. 06, 2025 installment $ / shares | Jul. 15, 2025 $ / shares | May 21, 2025 installment $ / shares | Apr. 15, 2025 $ / shares | Jan. 10, 2025 USD ($) $ / shares | Dec. 31, 2023 USD ($) | Dec. 31, 2025 USD ($) | Dec. 31, 2024 USD ($)
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |
Dividends paid, ordinary shares per share (in US dollar per share) |  |  |  |  |  |  | $ 0.75 | $ 1.00 |  |  |
Dividends approved, ordinary shares per share (in US dollar per share) |  |  |  |  |  | $ 3.00 |  |  |  |  |
Dividend payable, number of quarterly installments | installment |  |  |  |  |  | 4 |  |  |  |  |
Dividends payable, ordinary shares per share (in US dollar per share) |  |  | $ 0.75 |  | $ 0.75 |  |  |  |  |  |
Special interim dividends approved, ordinary shares per share (in US dollar per share) |  |  |  | $ 2.50 |  |  |  |  |  |  |
Special interim dividend payable, number of quarterly installments | installment |  |  |  | 2 |  |  |  |  |  |  |
Special interim dividends payable, ordinary shares per share (in US dollar per share) |  |  | $ 1.25 |  |  |  |  |  |  |  |
Dividends paid, ordinary shares | $ |  |  |  |  |  |  |  | $ 172 | $ 0 |  |
Statutory reserves unavailable for distribution | $ |  |  |  |  |  |  |  |  | $ 491 | $ 661 | $ 562
Dividend distribution |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |
Dividends payable, ordinary shares per share (in US dollar per share) |  | $ 0.75 |  |  |  |  |  |  |  |  |
Forecast |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |
Dividends payable, ordinary shares per share (in US dollar per share) | $ 0.75 |  |  |  |  |  |  |  |  |  |
Special interim dividends payable, ordinary shares per share (in US dollar per share) | $ 1.25 |  |  |  |  |  |  |  |  |  |

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