Income Taxes - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Mar. 31, 2019	Apr. 01, 2017
Income Tax Contingency [Line Items]
Effective income tax rate	15.60%	33.50%
Foreign earnings not indefinitely reinvested	$ 467
Potential federal and state cost from tax examinations	462
Decrease in liability for uncertain tax positions		$ 44
Reasonably possible reduction in liability for uncertain tax positions	$ 5
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 receivable			$ 59
Tax indemnification payable			$ 15