Earnings per Share - Schedule of Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended		9 Months Ended
	Dec. 31, 2017	Dec. 30, 2016	Dec. 31, 2017	Dec. 30, 2016
Earnings Per Share [Abstract]
Net income attributable to DXC common shareholders:	$ 776	$ 31	$ 1,191	$ 25
Common share information:
Weighted average common shares outstanding for basic EPS (in shares)	285,380	140,880	284,700	140,130
Dilutive effect of stock options and equity awards (in shares)	4,390	3,930	4,830	3,670
Weighted average common shares outstanding for diluted EPS (in shares)	289,770	144,810	289,530	143,800
Earnings per share:
Basic (in dollars per share)	$ 2.72	$ 0.22	$ 4.18	$ 0.18
Diluted (in dollars per share)	$ 2.68	$ 0.21	$ 4.11	$ 0.17