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Fair value measurement - Contingent Consideration Obligations (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Business Combination, Contingent Consideration [Roll Forward] |  |  |  |
Beginning balance | $ 96 | $ 273 | $ 96 | $ 270
Payments | (2) | (2) | (4) | (4)
Net changes in valuations | 13 | (23) | 15 | (18)
Ending balance | $ 107 | $ 248 | $ 107 | $ 248

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