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Income Taxes - Schedule of Domestic and Foreign Pretax (Loss) Income from Continuing Operations (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Income Tax Disclosure [Abstract]      
Domestic $ (655) $ 84 $ 347
Foreign 208 183 95
(Loss) income before income taxes $ (447) $ 267 $ 442