Derivative Financial Instruments - Schedule of Amounts Recorded in Consolidated Balance Sheet (Details) - USD ($) $ in Millions	Sep. 30, 2025	Sep. 30, 2024
Derivatives, Fair Value [Line Items]
Foreign exchange derivative contracts in asset	$ 3
Foreign exchange derivative contracts in liability	6
Foreign Exchange Forward
Derivatives, Fair Value [Line Items]
Other assets	0	$ 0
Other liabilities	$ (3)	$ 0

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.

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.

+ References + Details