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Earnings per Share - Schedule of Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended
	Jun. 30, 2025	Jun. 30, 2024
Net income attributable to CSC common shareholders: [Abstract]
Net income attributable to DXC common shareholders:	$ 16	$ 26
Common share information:
Weighted average common shares outstanding for basic EPS (in shares)	181,100	179,660
Dilutive effect of stock options and equity awards (in shares)	3,860	3,270
Weighted average common shares outstanding for diluted EPS (in shares)	184,960	182,930
Earnings per share:
Basic (in dollars per share)	$ 0.09	$ 0.14
Diluted (in dollars per share)	$ 0.09	$ 0.14

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