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Stockholders' equity - Components of AOCI (Details) - USD ($) $ in Millions	3 Months Ended				9 Months Ended
	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Increase (Decrease) in AOCI [Roll Forward]
Balance as of beginning of period	$ 6,781	$ 5,348	$ 3,661	$ 2,419	$ 3,661	$ 6,700
Foreign currency translation adjustments	(44)			(109)	(5)	(225)
Balance as of end of period	7,656	6,781	5,348	3,653	7,656	3,653
Foreign currency translation
Increase (Decrease) in AOCI [Roll Forward]
Balance as of beginning of period	(309)	(320)	(348)		(348)
Foreign currency translation adjustments	(44)	11	28
Income taxes	0	0	0
Balance as of end of period	(353)	(309)	(320)		(353)
Cash flow hedges
Increase (Decrease) in AOCI [Roll Forward]
Balance as of beginning of period	20	42	128		128
Unrealized losses	177	50	(71)
Reclassification adjustments to income	53	(87)	(30)
Income taxes	(49)	15	15
Balance as of end of period	201	20	42		201
Other
Increase (Decrease) in AOCI [Roll Forward]
Balance as of beginning of period	9	10	(11)		(11)
Unrealized losses	0	0	0
Other	17	(1)	21
Balance as of end of period	26	9	10		26
AOCI
Increase (Decrease) in AOCI [Roll Forward]
Balance as of beginning of period	(280)	(268)	(231)	(672)	(231)	(796)
Foreign currency translation adjustments	(44)	11	28
Unrealized losses	177	50	(71)
Reclassification adjustments to income	53	(87)	(30)
Other	17	(1)	21
Income taxes	(49)	15	15
Balance as of end of period	$ (126)	$ (280)	$ (268)	$ (652)	$ (126)	$ (652)

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