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Goodwill and Other Intangible Assets - Other Intangible Assets (Details) - USD ($) $ in Millions	Jun. 30, 2021	Sep. 30, 2020
Intangible Assets [Line Items]
Gross carrying amount, total intangible assets	$ 7,755	$ 7,090
Total Intangible Assets, Net	5,679	5,356
Definite-Lived Intangible Assets, Gross [Abstract]
Gross Carrying Amount	5,310	4,762
Accumulated Amortization	(2,076)	(1,734)
Total Definite-Lived Intangible Assets, Net	3,234	3,028
Indefinite-lived Intangible Assets (Excluding Goodwill) [Abstract]
Carrying Amount, Gross and Net	2,445	2,328
Technology
Definite-Lived Intangible Assets, Gross [Abstract]
Gross Carrying Amount	1,484	1,332
Accumulated Amortization	(601)	(497)
Total Definite-Lived Intangible Assets, Net	883	835
Customer Relationships
Definite-Lived Intangible Assets, Gross [Abstract]
Gross Carrying Amount	3,107	2,773
Accumulated Amortization	(1,146)	(969)
Total Definite-Lived Intangible Assets, Net	1,961	1,804
Miscellaneous
Definite-Lived Intangible Assets, Gross [Abstract]
Gross Carrying Amount	719	657
Accumulated Amortization	(329)	(268)
Total Definite-Lived Intangible Assets, Net	390	389
Trademarks/trade names
Indefinite-lived Intangible Assets (Excluding Goodwill) [Abstract]
Carrying Amount, Gross and Net	2,365	2,248
Miscellaneous
Indefinite-lived Intangible Assets (Excluding Goodwill) [Abstract]
Carrying Amount, Gross and Net	$ 80	$ 80

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