CONDENSED CONSOLIDATED BALANCE SHEETS (unaudited) - Parenthetical - USD ($) $ in Millions	Sep. 30, 2019	Mar. 31, 2019
Current assets:
Allowance for doubtful accounts	$ 1	$ 0
Intangible and other assets:
Accumulated amortization	414	299
Property and equipment, accumulated depreciation and amortization	$ 141	$ 148
Equity
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)	165,986,855	165,844,994
Common stock, outstanding (in shares)	161,866,236	163,099,080
Treasury stock (in shares)	4,120,619	2,745,914