Income Taxes - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Mar. 31, 2019	Apr. 01, 2017
Income Tax Contingency [Line Items]
Effective income tax rate	48.10%	24.60%	25.60%	46.00%
Foreign earnings not indefinitely reinvested	$ 433		$ 433
Potential federal and state cost from tax examinations			466
Liability for uncertain tax positions increase	8
Reasonably possible reduction in liability for uncertain tax positions	$ 15		$ 15
HPES
Income Tax Contingency [Line Items]
Tax indemnification receivable, uncertain tax positions						$ 27
Tax indemnification receivable, tax indemnification payable						68
Tax indemnification payable						$ 112
Perspecta
Income Tax Contingency [Line Items]
Tax indemnification payable					$ 15
Tax indemnification receivable					$ 59