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Fair value measurement - Schedule of Contingent Consideration Obligations (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Business Combination, Contingent Consideration [Roll Forward] |  |  |
Beginning balance | $ 96 | $ 270 | $ 342
Payments | (8) | (9) | (7)
Net changes in valuations | 18 | (165) | (65)
Ending balance | $ 106 | $ 96 | $ 270

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