CONDENSED CONSOLIDATED BALANCE SHEETS (unaudited) (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2018	Mar. 31, 2018
Current assets:
Allowance for doubtful accounts	$ 57	$ 40
Intangible and other assets:
Accumulated amortization	4,050	3,369
Accumulated depreciation	$ 3,654	$ 3,686
CSC 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)	271,631,683	286,393,147
Common stock in treasury, at cost (in shares)	1,754,722	1,016,947