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Stockholders' Equity - Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	6 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
AOCI Including Portion Attributable to Noncontrolling Interest [Abstract]
Beginning balance	$ 5,308	$ 5,129
Other comprehensive loss before reclassifications	(90)	45
Amounts reclassified from accumulated other comprehensive loss	(90)	(4)
Ending balance	5,083	4,751
Foreign Currency Translation Adjustments
AOCI Including Portion Attributable to Noncontrolling Interest [Abstract]
Beginning balance	(554)	(851)
Other comprehensive loss before reclassifications	(92)	28
Amounts reclassified from accumulated other comprehensive loss	(86)	0
Ending balance	(732)	(823)
Foreign Currency Translation Adjustments | HPS Business
AOCI Including Portion Attributable to Noncontrolling Interest [Abstract]
Amounts reclassified from accumulated other comprehensive loss	(86)
Cash Flow Hedges
AOCI Including Portion Attributable to Noncontrolling Interest [Abstract]
Beginning balance	(1)	(20)
Other comprehensive loss before reclassifications	7	12
Amounts reclassified from accumulated other comprehensive loss	0	6
Ending balance	6	(2)
Available-for-sale Securities
AOCI Including Portion Attributable to Noncontrolling Interest [Abstract]
Beginning balance		9
Other comprehensive loss before reclassifications		5
Amounts reclassified from accumulated other comprehensive loss		0
Ending balance		14
Pension and Other Post-retirement Benefit Plans
AOCI Including Portion Attributable to Noncontrolling Interest [Abstract]
Beginning balance	253	259
Other comprehensive loss before reclassifications	(5)	0
Amounts reclassified from accumulated other comprehensive loss	(4)	(10)
Ending balance	244	249
Accumulated Other Comprehensive Loss
AOCI Including Portion Attributable to Noncontrolling Interest [Abstract]
Beginning balance	(302)	(603)
Ending balance	$ (482)	$ (562)

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Amount after tax, before reclassification adjustments of other comprehensive income (loss).

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Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity.

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