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, 2021	Sep. 30, 2020	Sep. 30, 2019
Intangibles Other Than Goodwill [Line Items]
Gross carrying amount	$ 5,911	$ 5,106
Less: Accumulated amortization	3,034	2,638
Net carrying amount	2,877	2,468
Amortization of intangible assets	470	369	$ 359
Future amortization expense, 2022	408
Future amortization expense, 2023	379
Future amortization expense, 2024	347
Future amortization expense, 2025	306
Future amortization expense, 2026	274
Customer Relationships [Member]
Intangibles Other Than Goodwill [Line Items]
Gross carrying amount	2,391	2,059
Less: Accumulated amortization	896	731
Net carrying amount	1,495	1,328
Intellectual Property [Member]
Intangibles Other Than Goodwill [Line Items]
Gross carrying amount	2,062	1,628
Less: Accumulated amortization	923	773
Net carrying amount	1,139	855
Capitalized Software [Member]
Intangibles Other Than Goodwill [Line Items]
Gross carrying amount	1,458	1,419
Less: Accumulated amortization	1,215	1,134
Net carrying amount	$ 243	$ 285