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Income Taxes - Reconciliation Using U.S. Statutory Rate (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Income Tax Disclosure [Abstract]
Computed tax expense at the federal statutory rate	$ 95	$ 70	$ 85
Foreign impact of taxation at different rates, repatriation, valuation allowance, and other	30	38	8
Global Intangible Low Taxed Income (GILTI)	15	23	18
Purification Solutions business divestiture		(179)
Impact of the Coronavirus Aid, Relief, and Economic Security ("CARES") Act of 2020			10
Impact of increase (decrease) in valuation allowance on U.S. deferred taxes	(156)	160	(1)
U.S. and state benefits from research and experimentation activities	(2)	(2)	(2)
Provision (settlement) of unrecognized tax benefits	2	1	1
Permanent differences, net	(4)	10	7
State taxes, net of federal effect	(8)	(19)	(3)
Provision (benefit) for income taxes	$ (28)	$ 102	$ 123

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Amount of reported income tax expense from difference to expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operations, attributable to global intangible low-taxed income (GILTI).

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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