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Goodwill and Other Intangibles - Summary of Intangible Assets (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Sep. 30, 2018
Finite Lived Intangible Assets [Line Items]    
Gross carrying amount $ 1,538 $ 1,546
Accumulated amortization (698) (639)
Net carrying amount 840 907
Indefinite-Lived Intangible Assets (Excluding Goodwill) [Abstract]    
Intangible Assets, Gross (Excluding Goodwill) 1,816 1,824
Intangibles 1,118 1,185
Trademarks and Trade Names [Member]    
Indefinite-Lived Intangible Assets (Excluding Goodwill) [Abstract]    
Trademarks and trade names 278 278
Trademarks and Trade Names [Member]    
Finite Lived Intangible Assets [Line Items]    
Gross carrying amount 66 66
Accumulated amortization (28) (25)
Net carrying amount 38 41
Intellectual Property [Member]    
Finite Lived Intangible Assets [Line Items]    
Gross carrying amount 719 721
Accumulated amortization (382) (350)
Net carrying amount 337 371
Customer and supplier relationships [Member]    
Finite Lived Intangible Assets [Line Items]    
Gross carrying amount 753 759
Accumulated amortization (288) (264)
Net carrying amount $ 465 $ 495