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Stockholders' Equity - Accumulated Other Comprehensive Income (Loss) - Rollforward (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2023
AOCI Including Portion Attributable to Noncontrolling Interest [Abstract]
Beginning balance	$ 3,066	$ 3,820	$ 5,375
Ending balance	3,490	3,066	3,820
Accumulated Other Comprehensive Loss
AOCI Including Portion Attributable to Noncontrolling Interest [Abstract]
Beginning balance	(732)	(774)	(385)
Current-period other comprehensive (loss) income	(19)	46	(340)
Amounts reclassified from accumulated other comprehensive (loss) income, net of taxes	(11)	(4)	(49)
Ending balance	(762)	(732)	(774)
Foreign Currency Translation Adjustments
AOCI Including Portion Attributable to Noncontrolling Interest [Abstract]
Beginning balance	(939)	(985)	(651)
Current-period other comprehensive (loss) income	(9)	46	(334)
Amounts reclassified from accumulated other comprehensive (loss) income, net of taxes	0	0	0
Ending balance	(948)	(939)	(985)
Cash Flow Hedges
AOCI Including Portion Attributable to Noncontrolling Interest [Abstract]
Beginning balance	0	(7)	10
Current-period other comprehensive (loss) income	(10)	0	(6)
Amounts reclassified from accumulated other comprehensive (loss) income, net of taxes	3	7	(11)
Ending balance	(7)	0	(7)
Pension and Other Post-retirement Benefit Plans
AOCI Including Portion Attributable to Noncontrolling Interest [Abstract]
Beginning balance	207	218	256
Current-period other comprehensive (loss) income	0	0	0
Amounts reclassified from accumulated other comprehensive (loss) income, net of taxes	(14)	(11)	(38)
Ending balance	$ 193	$ 207	$ 218

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