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Income Taxes - Components of Provision (Benefit) for Income Taxes (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Current      
Current income tax expense (benefit) $ 90 $ 122 $ 136
Deferred      
Deferred income tax expense (benefit) (33) 288 344
Income tax provision 57 410 480
Foreign tax authority | Ireland      
Current      
Current foreign tax expense 0 0 1
Deferred      
Deferred foreign tax expense 0 0 0
Income tax provision 57 410 480
Foreign tax authority | Other Foreign      
Current      
Current foreign tax expense 91 118 128
Deferred      
Deferred foreign tax expense (33) 287 (73)
United States      
Current      
US - Federal and State (1) 4 7
Deferred      
US - Federal and State $ 0 $ 1 $ 417