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Goodwill and Other Intangibles - Summary of Other Intangible Assets (Details) - USD ($) $ in Millions	Sep. 30, 2019	Sep. 30, 2018
Finite Lived Intangible Assets [Line Items]
Gross carrying amount	$ 1,522	$ 1,546
Accumulated amortization	(712)	(639)
Net carrying amount	810	907
Intangible Assets Net Excluding Goodwill [Abstract]
Gross carrying amount	1,800	1,824
Net carrying amount	1,088	1,185
Trademarks and Trade Names [Member]
Finite Lived Intangible Assets [Line Items]
Gross carrying amount	66	66
Accumulated amortization	(29)	(25)
Net carrying amount	37	41
Indefinite-Lived Intangible Assets (Excluding Goodwill) [Abstract]
Indefinite-lived intangible assets	278	278
Intellectual Property [Member]
Finite Lived Intangible Assets [Line Items]
Gross carrying amount	712	721
Accumulated amortization	(391)	(350)
Net carrying amount	321	371
Customer and supplier relationships [Member]
Finite Lived Intangible Assets [Line Items]
Gross carrying amount	744	759
Accumulated amortization	(292)	(264)
Net carrying amount	$ 452	$ 495

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

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