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Goodwill and Other Intangible Assets - Other Intangible Assets (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Sep. 30, 2019
Intangible Assets [Line Items]
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)	$ 62
Gross carrying amount, total intangible assets	6,912	$ 6,985
Total Intangible Assets, Net	5,391	5,632
Definite-Lived Intangible Assets, Gross [Abstract]
Gross Carrying Amount	4,628	4,613
Accumulated Amortization	(1,521)	(1,353)
Total Definite-Lived Intangible Assets, Net	3,107	3,260
Indefinite-lived Intangible Assets (Excluding Goodwill) [Abstract]
Carrying Amount, Gross and Net	2,284	2,372
Technology
Definite-Lived Intangible Assets, Gross [Abstract]
Gross Carrying Amount	1,306	1,307
Accumulated Amortization	(427)	(370)
Total Definite-Lived Intangible Assets, Net	879	937
Customer Relationships
Definite-Lived Intangible Assets, Gross [Abstract]
Gross Carrying Amount	2,704	2,722
Accumulated Amortization	(854)	(759)
Total Definite-Lived Intangible Assets, Net	1,850	1,963
Miscellaneous
Definite-Lived Intangible Assets, Gross [Abstract]
Gross Carrying Amount	618	584
Accumulated Amortization	(240)	(224)
Total Definite-Lived Intangible Assets, Net	378	360
Trademarks/trade names
Indefinite-lived Intangible Assets (Excluding Goodwill) [Abstract]
Carrying Amount, Gross and Net	2,205	2,282
Miscellaneous
Indefinite-lived Intangible Assets (Excluding Goodwill) [Abstract]
Carrying Amount, Gross and Net	$ 79	$ 90

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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount of impairment loss resulting from write-down of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit to fair value.

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