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, 2017	Sep. 30, 2016	Sep. 30, 2015
Intangibles Other Than Goodwill [Line Items]
Gross carrying amount	$ 3,541	$ 2,381
Less: Accumulated amortization	1,651	1,479
Net carrying amount	1,890	902
Amortization of intangible assets	222	177	$ 174
Future amortization expense, 2018	261
Future amortization expense, 2019	226
Future amortization expense, 2020	201
Future amortization expense, 2021	168
Future amortization expense, 2022	148
Customer Relationships [Member]
Intangibles Other Than Goodwill [Line Items]
Gross carrying amount	1,392	580
Less: Accumulated amortization	361	286
Net carrying amount	1,031	294
Intellectual Property [Member]
Intangibles Other Than Goodwill [Line Items]
Gross carrying amount	1,012	730
Less: Accumulated amortization	435	393
Net carrying amount	577	337
Capitalized Software [Member]
Intangibles Other Than Goodwill [Line Items]
Gross carrying amount	1,137	1,071
Less: Accumulated amortization	855	800
Net carrying amount	$ 282	$ 271