CONSOLIDATED COMBINED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Millions	Total	Common Stock	Additional Paid-in Capital	(Accumulated Deficit) Retained Earnings	Accumulated Other Comprehensive Loss	Treasury Shares	Parent Company Investment
Beginning balance (in shares) at Mar. 31, 2017		0
Beginning balance at Mar. 31, 2017	$ 416	$ 0	$ 0	$ 0	$ 0	$ 0	$ 416
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Effects of purchase accounting	2,434						2,434
Net (loss) income	208						208
Transfers to Parent, net	(329)						(329)
Ending balance (in shares) at Mar. 31, 2018		0
Ending balance at Mar. 31, 2018	2,729	$ 0	0	0	0	0	2,729
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Impact of adoption of new accounting standard	4						4
Net (loss) income	49						49
Transfers to Parent, net	(145)						(145)
Dividend to DXC prior to May 31, 2018	(984)		(984)
Ending balance (in shares) at May. 31, 2018		0
Ending balance at May. 31, 2018	2,637	$ 0	0	0	0	0	2,637
Beginning balance (in shares) at Mar. 31, 2018		0
Beginning balance at Mar. 31, 2018	2,729	$ 0	0	0	0	0	2,729
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	72
Repurchases of common stock		$ (60)
Dividends declared	(33)
Ending balance (in shares) at Mar. 31, 2019		165,845
Ending balance at Mar. 31, 2019	2,162	$ 2	2,242	2	(23)	(61)	0
Beginning balance (in shares) at May. 31, 2018		0
Beginning balance at May. 31, 2018	2,637	$ 0	0	0	0	0	2,637
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	23			23
Spin-Off activity (in shares)		142,426
Spin-Off activity		$ 2	2,635				(2,637)
Mergers activity (in shares)		23,273
Mergers activity	578		578
Other comprehensive loss	(23)				(23)
Share-based compensation expense	9		9
Repurchases of common stock	(60)					(60)
Stock option exercises and other common stock transactions (in shares)		146
Stock option exercises and other common stock transactions	1		2			(1)
Dividends declared	(33)		(12)	(21)
Separation-related tax adjustment	14		14
Ending balance (in shares) at Mar. 31, 2019		165,845
Ending balance at Mar. 31, 2019	2,162	$ 2	2,242	2	(23)	(61)	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	(676)			(676)
Other comprehensive loss	(46)				(46)
Share-based compensation expense	23		23
Repurchases of common stock	$ (66)	$ (65)				(66)
Stock option exercises and other common stock transactions (in shares)	57	375
Stock option exercises and other common stock transactions	$ (1)		1			(2)
Dividends declared	(39)			(39)
Ending balance (in shares) at Mar. 31, 2020		166,220
Ending balance at Mar. 31, 2020	$ 1,357	$ 2	$ 2,266	$ (713)	$ (69)	$ (129)	$ 0