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Income Taxes - Summary of Provision for Income Taxes Related to Continuing Operations (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Current      
Federal $ (2) $ 20 $ (26)
State (7) (2) (1)
Foreign 35 74 37
Total current income tax expense (benefit) 26 92 10
Deferred 20 (100) (26)
Income tax expense (benefit) $ 46 $ (8) $ (16)