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Goodwill and Other Intangible Assets - Other Intangible Assets (Details) - USD ($) $ in Millions	Dec. 31, 2017	Sep. 30, 2017
Intangible Assets [Line Items]
Gross carrying amount, total intangible assets	$ 7,501	$ 7,511
Net, Total Intangible Assets	6,657	6,741
Finite-Lived Intangible Assets, Gross [Abstract]
Gross Carrying Amount	4,892	4,885
Accumulated Amortization	(844)	(770)
Net, Total Amortized Intangible Assets	4,048	4,115
Indefinite-Lived Intangible Assets (Excluding Goodwill) [Abstract]
Carrying Amount, Gross and Net	2,609	2,626
Patented Technology
Finite-Lived Intangible Assets, Gross [Abstract]
Gross Carrying Amount	1,343	1,328
Accumulated Amortization	(174)	(137)
Net, Total Amortized Intangible Assets	1,169	1,191
Customer Relationships
Finite-Lived Intangible Assets, Gross [Abstract]
Gross Carrying Amount	3,136	3,168
Accumulated Amortization	(503)	(486)
Net, Total Amortized Intangible Assets	2,633	2,682
Miscellaneous
Finite-Lived Intangible Assets, Gross [Abstract]
Gross Carrying Amount	413	389
Accumulated Amortization	(167)	(147)
Net, Total Amortized Intangible Assets	246	242
Trademarks/trade names
Indefinite-Lived Intangible Assets (Excluding Goodwill) [Abstract]
Carrying Amount, Gross and Net	2,486	2,483
Miscellaneous
Indefinite-Lived Intangible Assets (Excluding Goodwill) [Abstract]
Carrying Amount, Gross and Net	$ 123	$ 143

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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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