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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2019	Sep. 30, 2018
Current assets
Allowance for doubtful accounts	$ 3	$ 3
Stockholders' Equity
Common stock, shares authorized	200,000,000	200,000,000
Common stock, par value per share (usd per share)	$ 0.01	$ 0.01
Common stock, shares, issued	60,000,000	62,000,000

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Amount of allowance for credit loss on accounts receivable, classified as current.

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Face amount or stated value per share of common stock.

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