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Goodwill and Other Intangible Assets - Other Intangible Assets (Details) - USD ($) $ in Millions	Mar. 31, 2021	Sep. 30, 2020
Intangible Assets [Line Items]
Gross carrying amount, total intangible assets	$ 7,223	$ 7,090
Total Intangible Assets, Net	5,259	5,356
Definite-Lived Intangible Assets, Gross [Abstract]
Gross Carrying Amount	4,866	4,762
Accumulated Amortization	(1,964)	(1,734)
Total Definite-Lived Intangible Assets, Net	2,902	3,028
Indefinite-lived Intangible Assets (Excluding Goodwill) [Abstract]
Carrying Amount, Gross and Net	2,357	2,328
Technology
Definite-Lived Intangible Assets, Gross [Abstract]
Gross Carrying Amount	1,351	1,332
Accumulated Amortization	(566)	(497)
Total Definite-Lived Intangible Assets, Net	785	835
Customer Relationships
Definite-Lived Intangible Assets, Gross [Abstract]
Gross Carrying Amount	2,805	2,773
Accumulated Amortization	(1,086)	(969)
Total Definite-Lived Intangible Assets, Net	1,719	1,804
Miscellaneous
Definite-Lived Intangible Assets, Gross [Abstract]
Gross Carrying Amount	710	657
Accumulated Amortization	(312)	(268)
Total Definite-Lived Intangible Assets, Net	398	389
Trademarks/trade names
Indefinite-lived Intangible Assets (Excluding Goodwill) [Abstract]
Carrying Amount, Gross and Net	2,277	2,248
Miscellaneous
Indefinite-lived Intangible Assets (Excluding Goodwill) [Abstract]
Carrying Amount, Gross and Net	$ 80	$ 80

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Intangible Assets [Line Items]

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