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Goodwill and Other Intangible Assets - Other Intangible Assets (Details) - USD ($) $ in Millions	Jun. 30, 2019	Sep. 30, 2018
Intangible Assets [Line Items]
Gross carrying amount, total intangible assets	$ 7,023	$ 7,222
Net, Total Intangible Assets	5,739	6,187
Finite-Lived Intangible Assets, Gross [Abstract]
Gross Carrying Amount	4,627	4,716
Accumulated Amortization	(1,284)	(1,035)
Net, Total Amortized Intangible Assets	3,343	3,681
Indefinite-lived Intangible Assets (Excluding Goodwill) [Abstract]
Carrying Amount, Gross and Net	2,396	2,506
Patented Technology
Finite-Lived Intangible Assets, Gross [Abstract]
Gross Carrying Amount	1,316	1,317
Accumulated Amortization	(342)	(251)
Net, Total Amortized Intangible Assets	974	1,066
Customer Relationships
Finite-Lived Intangible Assets, Gross [Abstract]
Gross Carrying Amount	2,745	2,941
Accumulated Amortization	(714)	(599)
Net, Total Amortized Intangible Assets	2,031	2,342
Miscellaneous
Finite-Lived Intangible Assets, Gross [Abstract]
Gross Carrying Amount	566	458
Accumulated Amortization	(228)	(185)
Net, Total Amortized Intangible Assets	338	273
Trademarks/trade names
Indefinite-lived Intangible Assets (Excluding Goodwill) [Abstract]
Carrying Amount, Gross and Net	2,306	2,386
Miscellaneous
Indefinite-lived Intangible Assets (Excluding Goodwill) [Abstract]
Carrying Amount, Gross and Net	$ 90	$ 120

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Intangible Assets [Line Items]

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