CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (unaudited) - USD ($) shares in Thousands, $ in Millions	Total	Common Stock	Additional Paid-in Capital	Accumulated Deficit	Accumulated Other Comprehensive Loss	Treasury Stock		Total DXC Equity	Non- Controlling Interest	Cumulative effect of adopting ASU 2016-13	Cumulative effect of adopting ASU 2016-13 Accumulated Deficit	Cumulative effect of adopting ASU 2016-13 Total DXC Equity
Beginning balance (in shares) at Mar. 31, 2020		255,674
Beginning balance at Mar. 31, 2020	$ 5,129	$ 3	$ 10,714	$ (5,177)	$ (603)	$ (152)		$ 4,785	$ 344	$ (4)	$ (4)	$ (4)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	658			649				649	9
Other comprehensive income (loss)	199				196			196	3
Share-based compensation expense	33		33					33
Acquisition of treasury stock	(4)					(4)		(4)
Stock option exercises and other common stock transactions (in shares)		1,127
Stock option exercises and other common stock transactions	1		1					1
Non-controlling interest distributions and other	(17)			(1)				(1)	(16)
Ending balance (in shares) at Dec. 31, 2020		256,801
Ending balance at Dec. 31, 2020	5,995	$ 3	10,748	(4,533)	(407)	(156)		5,655	340
Beginning balance (in shares) at Sep. 30, 2020		256,522
Beginning balance at Sep. 30, 2020	4,751	$ 3	10,746	(5,631)	(562)	(155)		4,401	350
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	1,103			1,098				1,098	5
Other comprehensive income (loss)	156				155			155	1
Share-based compensation expense	1		1					1
Acquisition of treasury stock	(1)					(1)		(1)
Stock option exercises and other common stock transactions (in shares)		279
Stock option exercises and other common stock transactions	1		1					1
Non-controlling interest distributions and other	(16)							0	(16)
Ending balance (in shares) at Dec. 31, 2020		256,801
Ending balance at Dec. 31, 2020	5,995	$ 3	10,748	(4,533)	(407)	(156)		5,655	340
Beginning balance (in shares) at Mar. 31, 2021		257,053
Beginning balance at Mar. 31, 2021	5,308	$ 3	10,761	(5,331)	(302)	(158)	[1]	4,973	335
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	197			188				188	9
Other comprehensive income (loss)	(72)				(83)			(83)	11
Share-based compensation expense	63		63					63
Acquisition of treasury stock	(13)					(13)	[1]	(13)
Share repurchase program (in shares)		(10,618)
Share repurchase program	(363)		(449)	86				(363)
Stock option exercises and other common stock transactions (in shares)		1,921
Stock option exercises and other common stock transactions	11		11					11
Non-controlling interest distributions and other	(44)		(3)	(1)				(4)	(40)
Ending balance (in shares) at Dec. 31, 2021		248,356
Ending balance at Dec. 31, 2021	5,087	$ 3	10,383	(5,058)	(385)	(171)	[1]	4,772	315
Beginning balance (in shares) at Sep. 30, 2021		255,003
Beginning balance at Sep. 30, 2021	5,083	$ 3	10,646	(5,225)	(482)	(170)	[1]	4,772	311
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	102			98				98	4
Other comprehensive income (loss)	98				97			97	1
Share-based compensation expense	23		23					23
Acquisition of treasury stock	(1)					(1)	[1]	(1)
Share repurchase program (in shares)		(6,756)
Share repurchase program	(213)		(286)	73				(213)
Stock option exercises and other common stock transactions (in shares)		109
Stock option exercises and other common stock transactions	0							0
Non-controlling interest distributions and other	(5)			(4)				(4)	(1)
Ending balance (in shares) at Dec. 31, 2021		248,356
Ending balance at Dec. 31, 2021	$ 5,087	$ 3	$ 10,383	$ (5,058)	$ (385)	$ (171)	[1]	$ 4,772	$ 315

[1] 2,807,321 treasury shares as of December 31, 2021.