Earnings per Share - Schedule of Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended
	Jun. 30, 2017	Jul. 01, 2016
Earnings Per Share [Abstract]
Net income (loss) attributable to DXC common shareholders:	$ 159	$ (21)
Common share information:
Weighted average common shares outstanding for basic EPS (in shares)	283,830	138,980
Dilutive effect of stock options and equity awards (in shares)	5,640	0
Weighted average common shares outstanding for diluted EPS (in shares)	289,470	138,980
Earnings (loss) per share:
Basic (in dollars per share)	$ 0.56	$ (0.15)
Diluted (in dollars per share)	$ 0.55	$ (0.15)