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Stockholders' equity - Schedule of Components of AOCI (Details) $ in Millions	3 Months Ended
	Mar. 31, 2025 USD ($)
Increase (Decrease) in AOCI [Roll Forward]
Beginning balance	$ 5,877
Ending balance	6,207
Foreign currency translation adjustments
Increase (Decrease) in AOCI [Roll Forward]
Beginning balance	(374)
Foreign currency translation adjustments	57
Unrealized losses	0
Reclassification adjustments into earnings	0
Other	0
Income taxes	0
Ending balance	(317)
Cash flow hedges
Increase (Decrease) in AOCI [Roll Forward]
Beginning balance	287
Foreign currency translation adjustments	0
Unrealized losses	(146)
Reclassification adjustments into earnings	(139)
Other	0
Income taxes	62
Ending balance	64
Other
Increase (Decrease) in AOCI [Roll Forward]
Beginning balance	21
Foreign currency translation adjustments	0
Unrealized losses	0
Reclassification adjustments into earnings	0
Other	1
Income taxes	0
Ending balance	22
AOCI
Increase (Decrease) in AOCI [Roll Forward]
Beginning balance	(66)
Foreign currency translation adjustments	57
Unrealized losses	(146)
Reclassification adjustments into earnings	(139)
Other	1
Income taxes	62
Ending balance	$ (231)

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