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Income Taxes - Consolidated Income (Loss) Before Income Taxes and Noncontrolling Interests (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Income Tax Contingency [Line Items]      
Income before income taxes and noncontrolling interests $ (429) $ 2 $ (1,121)
Foreign tax authority | Ireland      
Income Tax Contingency [Line Items]      
Income before income taxes and noncontrolling interests (3) (1) 4
Foreign tax authority | Other Foreign      
Income Tax Contingency [Line Items]      
Income before income taxes and noncontrolling interests (315) 173 (801)
United States      
Income Tax Contingency [Line Items]      
Income before income taxes and noncontrolling interests $ (111) $ (170) $ (324)