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Goodwill and Other Intangible Assets - Other Intangible Assets (Details) - USD ($) $ in Millions	Dec. 31, 2018	Sep. 30, 2018
Intangible Assets [Line Items]
Gross carrying amount, total intangible assets	$ 7,209	$ 7,222
Net, Total Intangible Assets	6,080	6,187
Finite-Lived Intangible Assets, Gross [Abstract]
Gross Carrying Amount	4,750	4,716
Accumulated Amortization	(1,129)	(1,035)
Net, Total Amortized Intangible Assets	3,621	3,681
Indefinite-Lived Intangible Assets (Excluding Goodwill) [Abstract]
Carrying Amount, Gross and Net	2,459	2,506
Patented Technology
Finite-Lived Intangible Assets, Gross [Abstract]
Gross Carrying Amount	1,306	1,317
Accumulated Amortization	(279)	(251)
Net, Total Amortized Intangible Assets	1,027	1,066
Customer Relationships
Finite-Lived Intangible Assets, Gross [Abstract]
Gross Carrying Amount	2,926	2,941
Accumulated Amortization	(649)	(599)
Net, Total Amortized Intangible Assets	2,277	2,342
Miscellaneous
Finite-Lived Intangible Assets, Gross [Abstract]
Gross Carrying Amount	518	458
Accumulated Amortization	(201)	(185)
Net, Total Amortized Intangible Assets	317	273
Trademarks/trade names
Indefinite-Lived Intangible Assets (Excluding Goodwill) [Abstract]
Carrying Amount, Gross and Net	2,369	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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
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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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