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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, 2021
Sep. 30, 2020
Sep. 30, 2019
Income Tax Disclosure [Abstract]      
Domestic $ 182 $ (655) $ 84
Foreign 274 208 183
Income (loss) before income taxes $ 456 $ (447) $ 267