Other Deductions, Net (Schedule Of Other Deductions, Net) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2017	Mar. 31, 2016
Other deductions, net [Line Items]
Amortization of intangibles	$ 21	$ 22	$ 43	$ 44
Restructuring costs	13	11	24	18
Other	49	33	49	58
Total	83	$ 66	116	$ 120
Acquisition/divestiture costs	11		21
Bad debt expense	13		11
Change in gain (loss) from foreign currency transactions	$ 12		$ 46