Intangible Assets - Summary of Intangible Assets (Details) - USD ($) $ in Millions	Mar. 31, 2020	Mar. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	$ 1,708	$ 1,765
Accumulated Amortization	(515)	(299)
Net Carrying Value	1,193	1,466
Program assets
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	1,458	1,525
Accumulated Amortization	(367)	(194)
Net Carrying Value	1,091	1,331
Software
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	73	87
Accumulated Amortization	(62)	(58)
Net Carrying Value	11	29
Developed technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	123	105
Accumulated Amortization	(48)	(22)
Net Carrying Value	75	83
Backlog
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	28	22
Accumulated Amortization	(26)	(18)
Net Carrying Value	2	4
Outsourcing contract costs
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	26	25
Accumulated Amortization	(12)	(7)
Net Carrying Value	14	18
Favorable leases
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	0	1
Accumulated Amortization	0	0
Net Carrying Value	$ 0	$ 1