Derivative instruments and hedging activities - Summary of Classification and Fair Values of Derivative Instruments (Detail) - USD ($) $ in Millions	Sep. 30, 2026	Dec. 31, 2025
Designated as hedging instruments \| Options and forward contracts \| Balance Sheet Location [Axis]: us-gaap:OtherAssetsCurrent
Derivative [Line Items]
Asset derivatives:	$ 0	$ 0
Designated as hedging instruments \| Options and forward contracts \| Balance Sheet Location [Axis]: us-gaap:OtherLiabilitiesCurrent
Derivative [Line Items]
Liability derivatives:	0	0
Designated as hedging instruments \| Cross-currency interest rate swap-cash flow hedge \| Balance Sheet Location [Axis]: us-gaap:OtherLiabilitiesNoncurrent
Derivative [Line Items]
Liability derivatives:	(14)	(19)
Not designated as hedging instruments \| Options and forward contracts \| Balance Sheet Location [Axis]: us-gaap:OtherAssetsCurrent
Derivative [Line Items]
Asset derivatives:	52	86
Not designated as hedging instruments \| Options and forward contracts \| Balance Sheet Location [Axis]: us-gaap:OtherLiabilitiesCurrent
Derivative [Line Items]
Liability derivatives:	(56)	(38)
Not designated as hedging instruments \| Cross-currency interest rate swap-cash flow hedge \| Balance Sheet Location [Axis]: us-gaap:OtherLiabilitiesNoncurrent
Derivative [Line Items]
Liability derivatives:	$ 0	$ 0