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Goodwill and Other Intangible Assets - Other Intangible Assets (Details) - USD ($) $ in Millions	Dec. 31, 2020	Sep. 30, 2020
Intangible Assets [Line Items]
Gross carrying amount, total intangible assets	$ 7,253	$ 7,090
Total Intangible Assets, Net	5,384	5,356
Definite-Lived Intangible Assets, Gross [Abstract]
Gross Carrying Amount	4,882	4,762
Accumulated Amortization	(1,869)	(1,734)
Total Definite-Lived Intangible Assets, Net	3,013	3,028
Indefinite-lived Intangible Assets (Excluding Goodwill) [Abstract]
Carrying Amount, Gross and Net	2,371	2,328
Technology
Definite-Lived Intangible Assets, Gross [Abstract]
Gross Carrying Amount	1,354	1,332
Accumulated Amortization	(536)	(497)
Total Definite-Lived Intangible Assets, Net	818	835
Customer Relationships
Definite-Lived Intangible Assets, Gross [Abstract]
Gross Carrying Amount	2,826	2,773
Accumulated Amortization	(1,040)	(969)
Total Definite-Lived Intangible Assets, Net	1,786	1,804
Miscellaneous
Definite-Lived Intangible Assets, Gross [Abstract]
Gross Carrying Amount	702	657
Accumulated Amortization	(293)	(268)
Total Definite-Lived Intangible Assets, Net	409	389
Trademarks/trade names
Indefinite-lived Intangible Assets (Excluding Goodwill) [Abstract]
Carrying Amount, Gross and Net	2,291	2,248
Miscellaneous
Indefinite-lived Intangible Assets (Excluding Goodwill) [Abstract]
Carrying Amount, Gross and Net	$ 80	$ 80

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