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Fair value measurement - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Remeasurement of contingent consideration liability $ 18 $ (165) $ (65)
Carrying value of long-term debt, including current portion 60,099 64,613  
Fixed-rate notes      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Aggregate fair value of long-term debt, including current portion 54,900 59,200  
Carrying value of long-term debt, including current portion $ 58,300 $ 60,600