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Stockholders' equity - Components of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024
Increase (Decrease) in AOCI [Roll Forward]
Beginning balance	$ 5,925	$ 5,022	$ 6,232
Ending balance	7,527	5,925	5,022
Foreign currency translation adjustments
Increase (Decrease) in AOCI [Roll Forward]
Beginning balance	(337)	(322)	(298)
Foreign currency translation adjustments	71	(15)	(24)
Unrealized gains (losses)	0	0	0
Reclassification adjustments into earnings	0	0	0
Other	0	0	0
Income taxes	0	0	0
Ending balance	(266)	(337)	(322)
Cash flow hedges
Increase (Decrease) in AOCI [Roll Forward]
Beginning balance	155	104	(22)
Foreign currency translation adjustments	0	0	0
Unrealized gains (losses)	(158)	117	178
Reclassification adjustments into earnings	(166)	(52)	(20)
Other	0	0	0
Income taxes	71	(14)	(32)
Ending balance	(98)	155	104
Other
Increase (Decrease) in AOCI [Roll Forward]
Beginning balance	27	28	31
Foreign currency translation adjustments	0	0	0
Unrealized gains (losses)	0	0	0
Reclassification adjustments into earnings	0	0	0
Other	1	(1)	(3)
Income taxes	0	0	0
Ending balance	28	27	28
AOCI
Increase (Decrease) in AOCI [Roll Forward]
Beginning balance	(155)	(190)	(289)
Foreign currency translation adjustments	71	(15)	(24)
Unrealized gains (losses)	(158)	117	178
Reclassification adjustments into earnings	(166)	(52)	(20)
Other	1	(1)	(3)
Income taxes	71	(14)	(32)
Ending balance	$ (336)	$ (155)	$ (190)

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