Income Taxes - Components of Deferred Income Taxes (Detail) - USD ($) $ in Millions	Sep. 30, 2023	Sep. 30, 2022
Components of Deferred Tax Assets [Abstract]
Deferred expenses	$ 50	$ 10
Intangible assets	42	39
Inventory	14	15
Operating lease liability	22	21
Other	6	32
U.S. federal interest expense carryforward	42	33
Pension and other benefits	24	29
Net operating loss carryforwards	244	224
Capital loss carryforwards	132	137
Foreign tax credit carryforwards	68	55
R&D credit carryforwards	49	47
Other business credit carryforwards	19	20
Subtotal	712	662
Valuation allowance	(498)	(580)
Total deferred tax assets	214	82
Property, plant and equipment	(47)	(59)
Right of use asset	(22)	(21)
Unremitted earnings of non-U.S. subsidiaries	(15)	(22)
Total deferred tax liabilities	$ (84)	$ (102)