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Income Taxes - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Income Tax Disclosure [Abstract]        
Income tax expense (benefit) $ 39 $ 41 $ 148 $ 127
Reasonably possible decrease in gross unrecognized tax benefits from ongoing audits and settlement $ 2   $ 2