Earnings (Loss) per Share - Schedule of Earnings (Loss) per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Earnings Per Share [Abstract]
Net income (loss) attributable to DXC common stockholders:	$ 27	$ (188)	$ 129	$ 90
Common share information:
Weighted average common shares outstanding for basic EPS (in shares)	229,960	252,400	231,210	253,530
Dilutive effect of stock options and equity awards (in shares)	3,210	0	3,720	5,370
Weighted average common shares outstanding for diluted EPS (in shares)	233,170	252,400	234,930	258,900
Earnings (loss) per share:
Basic (in dollars per share)	$ 0.12	$ (0.74)	$ 0.56	$ 0.35
Diluted (in dollars per share)	$ 0.12	$ (0.74)	$ 0.55	$ 0.35