CONDENSED CONSOLIDATED BALANCE SHEETS (unaudited) (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2021	Mar. 31, 2021
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 78	$ 91
Intangible assets, accumulated amortization	4,997	4,422
Property and equipment, accumulated depreciation	$ 4,062	$ 4,121
DXC stockholders’ equity:
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, authorized (in shares)	1,000,000	1,000,000
Preferred stock, shares issued (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, authorized (in shares)	750,000,000	750,000,000
Common stock, issued (in shares)	248,356,181	257,052,533
Treasury shares (in shares)	2,807,321	2,458,027