Income Taxes - Provision for Income Taxes from Continuing Operations (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Income Tax Disclosure [Abstract]
Federal	$ 17	$ 72	$ (68)
State and local, including Puerto Rico	32	42	43
Foreign	228	254	372
Total, Current	277	368	347
Domestic	(96)	(284)	(182)
Foreign	(33)	4	(103)
Total, Deferred	(129)	(280)	(285)
Income tax provision	148	88	62
Unrecognized tax benefits interest and penalties reflected in current year	$ (6)	$ 5	$ 1