Earnings per Share - Schedule of Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Earnings Per Share [Abstract]
Net income attributable to DXC common shareholders	$ 102	$ 278
Common share information:
Weighted average common shares outstanding for basic EPS (in shares)	232,480	254,670
Dilutive effect of stock options and equity awards (in shares)	4,900	5,650
Weighted average common shares outstanding for diluted EPS (in shares)	237,380	260,320
Earnings per share:
Basic (in dollars per share)	$ 0.44	$ 1.09
Diluted (in dollars per share)	$ 0.43	$ 1.07