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Stockholders' equity - Schedule of Components of AOCI (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2025	Sep. 30, 2025
Increase (Decrease) in AOCI [Roll Forward]
Beginning balance	$ 7,428	$ 5,877
Ending balance	9,619	9,619
Foreign currency translation adjustments
Increase (Decrease) in AOCI [Roll Forward]
Beginning balance	(231)	(374)
Foreign currency translation adjustments	11	154
Unrealized gains (losses)	0	0
Reclassification adjustments into earnings	0	0
Other	0	0
Income taxes	0	0
Ending balance	(220)	(220)
Cash flow hedges
Increase (Decrease) in AOCI [Roll Forward]
Beginning balance	(335)	287
Foreign currency translation adjustments	0	0
Unrealized gains (losses)	73	(396)
Reclassification adjustments into earnings	67	(256)
Other	0	0
Income taxes	(30)	140
Ending balance	(225)	(225)
Other
Increase (Decrease) in AOCI [Roll Forward]
Beginning balance	22	21
Foreign currency translation adjustments	0	0
Unrealized gains (losses)	0	0
Reclassification adjustments into earnings	0	0
Other	1	2
Income taxes	0	0
Ending balance	23	23
AOCI
Increase (Decrease) in AOCI [Roll Forward]
Beginning balance	(544)	(66)
Foreign currency translation adjustments	11	154
Unrealized gains (losses)	73	(396)
Reclassification adjustments into earnings	67	(256)
Other	1	2
Income taxes	(30)	140
Ending balance	$ (422)	$ (422)

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