Other Deductions, Net (Schedule Of Other Deductions, Net) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Other deductions, net [Line Items]
Amortization of intangibles	$ 51	$ 21	$ 107	$ 43
Restructuring costs	9	13	24	24
Other	39	49	56	49
Total	99	$ 83	$ 187	$ 116
Increase (decrease) in bad debt expense	(19)
Change in gain (loss) from foreign currency transactions	19
Acquisition/divestiture (costs) benefit	$ (27)