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Pension and other postretirement benefits - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Retirement Benefits [Abstract] |  |  |  |
Total pension plan assets transferred to plan | $ 55 |  |  |
Total pension plan obligations transferred to plan | 53 |  |  |
Defined contribution plan, cost | 21 | $ 18 | $ 48 | $ 43
Contributions to union-sponsored multiemployer pension plans | $ 11 | $ 11 | $ 17 | $ 17

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