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

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