Goodwill And Other Intangibles (Schedule Of Gross Carrying Amount And Accumulated Amortization Of Identifiable Intangible Assets By Major Class) (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Intangibles Other Than Goodwill [Line Items]
Gross carrying amount	$ 2,381	$ 2,284
Less: Accumulated amortization	1,479	1,346
Net carrying amount	902	938
Amortization of intangible assets	177	174	$ 167
Future amortization expense, 2017	172
Future amortization expense, 2018	154
Future amortization expense, 2019	128
Future amortization expense, 2020	105
Future amortization expense, 2021	88
Customer Relationships [Member]
Intangibles Other Than Goodwill [Line Items]
Gross carrying amount	580	591
Less: Accumulated amortization	286	247
Net carrying amount	294	344
Intellectual Property [Member]
Intangibles Other Than Goodwill [Line Items]
Gross carrying amount	730	675
Less: Accumulated amortization	393	361
Net carrying amount	337	314
Capitalized Software [Member]
Intangibles Other Than Goodwill [Line Items]
Gross carrying amount	1,071	1,018
Less: Accumulated amortization	800	738
Net carrying amount	$ 271	$ 280