Earnings Per Share - Schedule of Earnings (Loss) per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended		9 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2021	Dec. 31, 2020
Earnings Per Share [Abstract]
Net income attributable to DXC common shareholders:	$ 98	$ 1,098	$ 188	$ 649
Common share information:
Weighted average common shares outstanding for basic EPS (in shares)	250,270	254,320	252,440	254,030
Dilutive effect of stock options and equity awards (in shares)	4,550	1,430	5,150	1,170
Weighted average common shares outstanding for diluted EPS (in shares)	254,820	255,750	257,590	255,200
Earnings per share:
Basic (in dollars per share)	$ 0.39	$ 4.32	$ 0.74	$ 2.55
Diluted (in dollars per share)	$ 0.38	$ 4.29	$ 0.73	$ 2.54