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, 2020	Sep. 30, 2019	Sep. 30, 2018
Intangibles Other Than Goodwill [Line Items]
Gross carrying amount	$ 5,106	$ 4,872
Less: Accumulated amortization	2,638	2,257
Net carrying amount	2,468	2,615
Amortization of intangible assets	369	359	$ 314
Future amortization expense, 2021	352
Future amortization expense, 2022	316
Future amortization expense, 2023	291
Future amortization expense, 2024	256
Future amortization expense, 2025	236
Customer Relationships [Member]
Intangibles Other Than Goodwill [Line Items]
Gross carrying amount	2,059	1,973
Less: Accumulated amortization	731	582
Net carrying amount	1,328	1,391
Intellectual Property [Member]
Intangibles Other Than Goodwill [Line Items]
Gross carrying amount	1,628	1,565
Less: Accumulated amortization	773	650
Net carrying amount	855	915
Capitalized Software [Member]
Intangibles Other Than Goodwill [Line Items]
Gross carrying amount	1,419	1,334
Less: Accumulated amortization	1,134	1,025
Net carrying amount	$ 285	$ 309