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Accounting principles - Summary of employee benefits (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Disclosure Of Significant Accounting Policies [Abstract] |  |  |
Salaries and other remuneration | $ (417) | $ (393) | $ (379)
Statutory and contractual social security expenses | (102) | (113) | (109)
Pension expenses | (25) | (25) | (26)
Total employee benefits | $ (520) | $ (506) | $ (488)

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