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Fair value measurement - Narrative (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Carrying value of long-term debt, including current portion $ 54,587 $ 60,099
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 51,200 54,900
Carrying value of long-term debt, including current portion $ 52,800 $ 58,300