Statement of Financial Position (Paranthetical) - USD ($) $ in Millions	Sep. 30, 2017	Sep. 30, 2016
Allowance for Doubtful Accounts Receivable, Current	$ 20	$ 21
Preferred Stock, Par or Stated Value Per Share	$ 0.001	$ 0
Preferred Stock, Shares Issued	0	0
Preferred Stock, Shares Authorized	100,000,000	0
Preferred Stock, Shares Outstanding	0	0
Common Stock, Par or Stated Value Per Share	$ 0.001	$ 0
Common Stock, Shares Authorized	500,000,000	0
Common Stock, Shares, Issued	93,142,283	0
Common Stock, Shares, Outstanding	93,142,283	0