CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) $ in Millions		Total		Common Stock	Additional Paid-in Capital	Retained Earnings (Accumulated Deficit)	Accumulated Other Comprehensive Income (Loss)	Treasury Stock		Total DXC Equity	Non-Controlling Interest	As Previously Reported	As Previously Reported Common Stock	As Previously Reported Additional Paid-in Capital	As Previously Reported Retained Earnings (Accumulated Deficit)	As Previously Reported Accumulated Other Comprehensive Income (Loss)	As Previously Reported Treasury Stock		As Previously Reported Total DXC Equity	As Previously Reported Non-Controlling Interest	Restatement Adjustment		Restatement Adjustment Common Stock	[1]	Restatement Adjustment Additional Paid-in Capital	[1]	Restatement Adjustment Retained Earnings (Accumulated Deficit)	Restatement Adjustment Treasury Stock	[1]	Restatement Adjustment Total DXC Equity
Balance (in shares) at Mar. 31, 2017				141,299,000									151,932,000										(10,633,000)
Balance at Mar. 31, 2017		$ 2,166		$ 1	$ 2,219	$ (170)	$ (162)	$ 0		$ 1,888	$ 278	$ 2,166	$ 152	$ 2,565	$ (170)	$ (162)	$ (497)		$ 1,888	$ 278	$ 0	[1]	$ (151)		$ (346)			$ 497
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Business acquired in purchase, net of issuance costs (in shares)	[2]			141,741,000
Business acquired in purchase, net of issuance costs	[2]	9,900		$ 2	9,848					9,850	50
Net (loss) income		1,782	[3]			1,751				1,751	31
Other comprehensive Income (loss)		220					220			220
Share-based compensation expense		92			92					92
Acquisition of treasury stock		(85)						(85)		(85)
Share repurchase program (in shares)				(1,538,000)
Share repurchase program		(137)			(66)	(71)				(137)
Stock option exercises and other common stock transactions (in shares)				4,891,000
Stock option exercises and other common stock transactions		117			117					117
Dividends declared		(209)				(209)				(209)
Non-controlling interest distributions and other		(9)									(9)
Balance (in shares) at Mar. 31, 2018				286,393,000									286,393,000
Balance at Mar. 31, 2018		13,837		$ 3	12,210	1,301	58	(85)		13,487	350	$ 13,837	$ 3	$ 12,210	$ 1,301	$ 58	$ (85)	[4]	$ 13,487	$ 350	$ 114						$ 114			$ 114
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income		1,262				1,257				1,257	5
Other comprehensive Income (loss)		(305)					(302)			(302)	(3)
Share-based compensation expense		74			74					74
Acquisition of treasury stock		(51)						(51)	[4]	(51)
Share repurchase program (in shares)				(19,343,000)
Share repurchase program		$ (1,339)			(845)	(494)				(1,339)
Stock option exercises and other common stock transactions (in shares)		969,103		3,164,000
Stock option exercises and other common stock transactions		$ 37			37					37
Dividends declared		(209)				(209)				(209)
Non-controlling interest distributions and other		(29)									(29)
Divestiture of USPS		(1,666)			(175)	(1,491)				(1,666)
Balance (in shares) at Mar. 31, 2019				270,214,000
Balance at Mar. 31, 2019		$ 11,725		$ 3	11,301	478	(244)	(136)	[4],[5]	11,402	323
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Treasury shares		1,788,658
Net (loss) income		$ (5,358)				(5,369)				(5,369)	11
Other comprehensive Income (loss)		(348)					(359)			(359)	11
Share-based compensation expense		70			70					70
Acquisition of treasury stock		(16)						(16)	[5]	(16)
Share repurchase program (in shares)				(15,934,000)
Share repurchase program		(736)			(669)	(67)				(736)
Stock option exercises and other common stock transactions (in shares)				1,394,000
Stock option exercises and other common stock transactions		12			12					12
Dividends declared		(219)				(219)				(219)
Non-controlling interest distributions and other		(1)									(1)
Balance (in shares) at Mar. 31, 2020				255,674,000
Balance at Mar. 31, 2020		$ 5,129		$ 3	$ 10,714	$ (5,177)	$ (603)	$ (152)	[5]	$ 4,785	$ 344
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Treasury shares		2,148,708

[1] ^{Certain prior year amounts were adjusted to retroactively reflect the legal capital of DXC.}

[2] ^{See Note 2 - "Acquisitions"}

[3] As a result of the USPS Separation, the Consolidated Statements of Operations, Consolidated Balance Sheets, and related financial information reflect USPS's operations and assets and liabilities as discontinued operations for all periods presented. The cash flows of USPS have not been segregated and are included in the Consolidated Statement of Cash flows for the fiscal year ended March 31, 2018 and through the separation date of May 31, 2018 in the Consolidated Statement of Cash Flows for the fiscal year ended March 31, 2019.

[4] 1,788,658 treasury shares as of March 31, 2019

[5] 2,148,708 treasury shares as of March 31, 2020