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, 2018	Sep. 30, 2017	Sep. 30, 2016
Intangibles Other Than Goodwill [Line Items]
Gross carrying amount	$ 4,667	$ 3,541
Less: Accumulated amortization	1,916	1,651
Net carrying amount	2,751	1,890
Amortization of intangible assets	314	222	$ 177
Future amortization expense, 2019	338
Future amortization expense, 2020	308
Future amortization expense, 2021	280
Future amortization expense, 2022	235
Future amortization expense, 2023	222
Customer Relationships [Member]
Intangibles Other Than Goodwill [Line Items]
Gross carrying amount	1,968	1,392
Less: Accumulated amortization	451	361
Net carrying amount	1,517	1,031
Intellectual Property [Member]
Intangibles Other Than Goodwill [Line Items]
Gross carrying amount	1,469	1,012
Less: Accumulated amortization	544	435
Net carrying amount	925	577
Capitalized Software [Member]
Intangibles Other Than Goodwill [Line Items]
Gross carrying amount	1,230	1,137
Less: Accumulated amortization	921	855
Net carrying amount	$ 309	$ 282