Derivatives And Other Financial Instruments (Estimated fair value of derivatives) (Details) - Foreign currency forward contracts - Designated as hedging instrument - USD ($) $ in Millions	Jun. 30, 2015	Sep. 30, 2014
Derivatives, Fair Value [Line Items]
Net liability	$ 0	$ (2)
Other current assets
Derivatives, Fair Value [Line Items]
Net liability	1	0
Other current liabilities
Derivatives, Fair Value [Line Items]
Net liability	$ (1)	$ (2)