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Goodwill and Other Intangible Assets Other Intangible Assets (Details) - USD ($) $ in Millions	Sep. 30, 2018	Sep. 30, 2017
Intangible Assets [Line Items]
Future amortization expense, 2017	$ 406
Gross carrying amount, total intangible assets	7,478	$ 7,511
Net, Total Intangible Assets	6,348	6,741
Finite-Lived Intangible Assets, Gross [Abstract]
Gross Carrying Amount	4,908	4,885
Accumulated Amortization	(1,130)	(770)
Net, Total Amortized Intangible Assets	3,778	4,115
Indefinite-Lived Intangible Assets (Excluding Goodwill) [Abstract]
Carrying Amount, Gross and Net	2,570	2,626
Patented Technology
Finite-Lived Intangible Assets, Gross [Abstract]
Gross Carrying Amount	1,334	1,328
Accumulated Amortization	(266)	(137)
Net, Total Amortized Intangible Assets	1,068	1,191
Customer Relationships
Finite-Lived Intangible Assets, Gross [Abstract]
Gross Carrying Amount	3,078	3,168
Accumulated Amortization	(664)	(486)
Net, Total Amortized Intangible Assets	2,414	2,682
Miscellaneous
Finite-Lived Intangible Assets, Gross [Abstract]
Gross Carrying Amount	496	389
Accumulated Amortization	(200)	(147)
Net, Total Amortized Intangible Assets	296	242
Trademarks
Indefinite-Lived Intangible Assets (Excluding Goodwill) [Abstract]
Carrying Amount, Gross and Net	2,448	2,483
Miscellaneous
Indefinite-Lived Intangible Assets (Excluding Goodwill) [Abstract]
Carrying Amount, Gross and Net	$ 122	$ 143

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Intangible Assets [Line Items]

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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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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