Derivatives And Other Financial Instruments (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2016	Mar. 31, 2015
Other Income [Member] | Foreign currency forward contracts
Derivative [Line Items]
Gain (loss) on foreign currency contracts included in other income (expense)	$ (2)	$ 3	$ 1	$ (1)