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Income Taxes - Narrative (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Income Tax Disclosure [Abstract]        
Income tax expense (benefit) $ 43 $ 39 $ 112 $ 148