Income Taxes - Provision for Income Taxes from Continuing Operations (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Income Tax Disclosure [Abstract]
Federal	$ 364	$ 17	$ 72
State and local, including Puerto Rico	87	32	42
Foreign	303	228	254
Total, Current	754	277	368
Domestic	(644)	(96)	(284)
Foreign	22	(33)	4
Total, Deferred	(622)	(129)	(280)
Income tax provision	132	148	88
Unrecognized tax benefits interest and penalties reflected in current year	$ 20	$ (6)	$ 5