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Stockholders' equity - Components of AOCI (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	$ 6,700	$ 9,409	$ 9,673
Foreign currency translation adjustments	496	(135)	9
Ending Balance	3,661	6,700	9,409
Cumulative effect of changes in accounting principles, net of taxes
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance			(2)
Foreign currency translation [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	(844)	(709)	(718)
Foreign currency translation adjustments	496	(135)	9
Income taxes	0	0	0
Ending Balance	(348)	(844)	(709)
Cash flow hedges [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	61	(263)	175
Unrealized gains	84	159	(61)
Reclassification adjustments to income	2	253	(501)
Income taxes	(19)	(88)	124
Ending Balance	128	61	(263)
Available-for-sale securities [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	0	1	22
Unrealized gains	0	(1)	6
Reclassification adjustments to income	0	0	(33)
Income taxes	0	0	6
Ending Balance	0	0	1
Other [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	(13)	(14)	(7)
Other gains	2	1	(7)
Ending Balance	(11)	(13)	(14)
AOCI [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	(796)	(985)	(528)
Foreign currency translation adjustments	496	(135)	9
Unrealized gains	84	158	(55)
Reclassification adjustments to income	2	253	(534)
Other gains	2	1	(7)
Income taxes	(19)	(88)	130
Ending Balance	$ (231)	$ (796)	(985)
AOCI [Member] | Cumulative effect of changes in accounting principles, net of taxes
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance			$ 0

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