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Employee Benefit Plans - Amounts Recognized in Consolidated Balance Sheets (Detail) - USD ($) $ in Millions	Sep. 30, 2024	Sep. 30, 2023
Pension Benefits [Member] \| U.S. Defined Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Other liabilities	$ (2)	$ (2)
Pension Benefits [Member] \| Foreign Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Other assets	31	30
Accounts payable and accrued liabilities	(2)	(1)
Other liabilities	(28)	(24)
Postretirement Benefits [Member] \| U.S. Defined Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Accounts payable and accrued liabilities	(2)	(2)
Other liabilities	(11)	(12)
Postretirement Benefits [Member] \| Foreign Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Accounts payable and accrued liabilities	(1)	(1)
Other liabilities	$ (11)	$ (10)