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, 2019	Sep. 30, 2018	Sep. 30, 2017
Intangibles Other Than Goodwill [Line Items]
Gross carrying amount	$ 4,872	$ 4,667
Less: Accumulated amortization	2,257	1,916
Net carrying amount	2,615	2,751
Amortization of intangible assets	359	314	$ 222
Future amortization expense, 2020	366
Future amortization expense, 2021	329
Future amortization expense, 2022	292
Future amortization expense, 2023	265
Future amortization expense, 2024	242
Customer Relationships [Member]
Intangibles Other Than Goodwill [Line Items]
Gross carrying amount	1,973	1,968
Less: Accumulated amortization	582	451
Net carrying amount	1,391	1,517
Intellectual Property [Member]
Intangibles Other Than Goodwill [Line Items]
Gross carrying amount	1,565	1,469
Less: Accumulated amortization	650	544
Net carrying amount	915	925
Capitalized Software [Member]
Intangibles Other Than Goodwill [Line Items]
Gross carrying amount	1,334	1,230
Less: Accumulated amortization	1,025	921
Net carrying amount	$ 309	$ 309