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Goodwill and Other Intangible Assets Other Intangible Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Intangible Assets [Line Items]
Document Period End Date	Sep. 30, 2019
Future amortization expense, 2017	$ 390
Gross carrying amount, total intangible assets	6,985	$ 7,222
Net, Total Intangible Assets	5,632	6,187
Finite-Lived Intangible Assets, Gross [Abstract]
Gross Carrying Amount	4,613	4,716
Accumulated Amortization	(1,353)	(1,035)
Net, Total Amortized Intangible Assets	3,260	3,681
Indefinite-lived Intangible Assets (Excluding Goodwill) [Abstract]
Carrying Amount, Gross and Net	2,372	2,506
Patented Technology
Finite-Lived Intangible Assets, Gross [Abstract]
Gross Carrying Amount	1,307	1,317
Accumulated Amortization	(370)	(251)
Net, Total Amortized Intangible Assets	937	1,066
Customer Relationships
Finite-Lived Intangible Assets, Gross [Abstract]
Gross Carrying Amount	2,722	2,941
Accumulated Amortization	(759)	(599)
Net, Total Amortized Intangible Assets	1,963	2,342
Miscellaneous
Finite-Lived Intangible Assets, Gross [Abstract]
Gross Carrying Amount	584	458
Accumulated Amortization	(224)	(185)
Net, Total Amortized Intangible Assets	360	273
Trademarks
Indefinite-lived Intangible Assets (Excluding Goodwill) [Abstract]
Carrying Amount, Gross and Net	2,282	2,386
Miscellaneous
Indefinite-lived Intangible Assets (Excluding Goodwill) [Abstract]
Carrying Amount, Gross and Net	$ 90	$ 120

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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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