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Income Tax - Effective Tax Rate (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Income Tax Disclosure [Abstract]        
(Provision) benefit for income taxes $ (43) $ (40) $ (133) $ (121)
Effective tax rate 28.00% 25.00% 29.00% 31.00%