CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (unaudited) - 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
Balance (in shares) at Mar. 31, 2018		286,393,000
Balance at Mar. 31, 2018	$ 13,837	$ 3	$ 12,210	$ 1,301	$ 58	$ (85)		$ 13,487	$ 350
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	525			521				521	4
Other comprehensive loss	(445)				(440)			(440)	(5)
Share-based compensation expense	40		40					40
Acquisition of treasury stock	(20)					(20)		(20)
Share repurchase program (in shares)		(5,228,000)
Share repurchase program	(451)		(251)	(200)				(451)
Stock option exercises and other common stock transactions (in shares)		1,354,000
Stock option exercises and other common stock transactions	26		26					26
Dividends declared	(109)			(109)				(109)
Non-controlling interest distributions and other	(12)								(12)
Divestiture of USPS	(1,668)		(177)	(1,491)				(1,668)
Balance (in shares) at Sep. 30, 2018		282,519,000
Balance at Sep. 30, 2018	11,837	$ 3	11,848	136	(382)	(105)		11,500	337
Balance (in shares) at Jun. 30, 2018		282,829,000
Balance at Jun. 30, 2018	11,814	$ 3	11,868	0	(312)	(87)		11,472	342
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	259			262				262	(3)
Other comprehensive loss	(69)				(70)			(70)	1
Share-based compensation expense	18		18					18
Acquisition of treasury stock	(18)					(18)		(18)
Share repurchase program (in shares)		(1,449,000)
Share repurchase program	(127)		(58)	(69)				(127)
Stock option exercises and other common stock transactions (in shares)		1,139,000
Stock option exercises and other common stock transactions	20		20					20
Dividends declared	(54)			(54)				(54)
Non-controlling interest distributions and other	(6)			(3)				(3)	(3)
Balance (in shares) at Sep. 30, 2018		282,519,000
Balance at Sep. 30, 2018	$ 11,837	$ 3	11,848	136	(382)	(105)		11,500	337
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Treasury shares	1,788,658
Balance (in shares) at Mar. 31, 2019		270,214,000
Balance at Mar. 31, 2019	$ 11,725	$ 3	11,301	478	(244)	(136)	[1]	11,402	323
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(1,947)			(1,956)				(1,956)	9
Other comprehensive loss	(206)				(184)			(184)	(22)
Share-based compensation expense	49		49					49
Acquisition of treasury stock	(14)					(14)	[1]	(14)
Share repurchase program (in shares)		(13,580,000)
Share repurchase program	(650)		(571)	(79)				(650)
Stock option exercises and other common stock transactions (in shares)		992,000
Stock option exercises and other common stock transactions	14		14					14
Dividends declared	(111)			(111)				(111)
Non-controlling interest distributions and other	10								10
Balance (in shares) at Sep. 30, 2019		257,626,000
Balance at Sep. 30, 2019	8,870	$ 3	10,793	(1,668)	(428)	(150)	[1]	8,550	320
Balance (in shares) at Jun. 30, 2019		263,709,000
Balance at Jun. 30, 2019	11,217	$ 3	10,916	494	(351)	(149)	[1]	10,913	304
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(2,115)			(2,119)				(2,119)	4
Other comprehensive loss	(75)				(77)			(77)	2
Share-based compensation expense	31		31					31
Acquisition of treasury stock	(1)					(1)	[1]	(1)
Share repurchase program (in shares)		(6,220,000)
Share repurchase program	(150)		(161)	11				(150)
Stock option exercises and other common stock transactions (in shares)		137,000
Stock option exercises and other common stock transactions	7		7					7
Dividends declared	(54)			(54)				(54)
Non-controlling interest distributions and other	10								10
Balance (in shares) at Sep. 30, 2019		257,626,000
Balance at Sep. 30, 2019	$ 8,870	$ 3	$ 10,793	$ (1,668)	$ (428)	$ (150)	[1]	$ 8,550	$ 320
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Treasury shares	2,018,148

[1] 2,018,148 treasury shares as of September 30, 2019.