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Income Taxes - Deferred Taxes (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Sep. 30, 2019
Income Tax Disclosure [Abstract]    
Other noncurrent assets $ 178 $ 199
Other noncurrent liabilities (175) (206)
Net deferred tax liabilities   $ (7)
Net deferred tax asset/(liability) $ 3