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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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