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Derivative Financial Instruments - Summary of Amounts Recorded in Consolidated Balance Sheets (Detail) - USD ($) $ in Millions	Dec. 31, 2023	Sep. 30, 2023
Derivatives, Fair Value [Line Items]
Foreign exchange derivative contracts in asset	$ 9
Foreign exchange derivative contracts in liability	15
Other Current Assets | Interest Rate Swap
Derivatives, Fair Value [Line Items]
Other assets	0	$ 2
Other Current Liabilities | Interest Rate Swap
Derivatives, Fair Value [Line Items]
Foreign currency forward exchange contract	(6)	$ 0
Other Current Liabilities | Foreign Exchange Contract
Derivatives, Fair Value [Line Items]
Foreign currency forward exchange contract	$ (6)

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- Definition

Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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- Definition

Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

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Fair value portion of asset contracts related to the exchange of different currencies, including, but not limited to, foreign currency options, forward contracts, and swaps.

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