Income Tax - Effective Tax Rate (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]
(Provision) benefit for income taxes	$ (41)	$ (49)	$ (90)	$ (73)
Effective tax rate	32.00%	32.00%	28.00%	35.00%