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Derivative instruments - Schedule of Effective Portion of Unrealized Gain (Loss) Recognized in AOCI (Details) - Cash flow hedge - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Derivative Instruments, Gain (Loss) [Line Items]
Total unrealized gains (losses)	$ 73	$ (158)	$ (396)	$ 137
Foreign currency forward contracts
Derivative Instruments, Gain (Loss) [Line Items]
Total unrealized gains (losses)	123	(238)	(592)	87
Cross-currency swap contracts
Derivative Instruments, Gain (Loss) [Line Items]
Total unrealized gains (losses)	$ (50)	$ 80	$ 196	$ 50

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