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(Loss) Earnings 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, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Earnings Per Share [Abstract]        
Net (loss) income attributable to DXC common shareholders: $ (188) $ (244) $ 90 $ (449)
Common share information:        
Weighted average common shares outstanding for basic EPS (in shares) 252,400 254,130 253,530 253,880
Dilutive effect of stock options and equity awards (in shares) 0 0 5,370 0
Weighted average common shares outstanding for diluted EPS (in shares) 252,400 254,130 258,900 253,880
(Loss) earnings per share:        
Basic (in dollars per share) $ (0.74) $ (0.96) $ 0.35 $ (1.77)
Diluted (in dollars per share) $ (0.74) $ (0.96) $ 0.35 $ (1.77)