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Fair Value Measurements - Summary of Fair Values of Outstanding Foreign Currency Derivatives (Details) - Foreign Exchange Contract [Member] - USD ($) $ in Millions		Dec. 31, 2025	Sep. 30, 2025
Accounts Receivable [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign currency derivative assets	[1]	$ 0	$ 0
Notional contract values		26	44
Accrued Expenses and Other Liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign currency derivative liabilities		2	1
Notional contract values		$ 171	$ 128
[1] Zero denotes less than $1 million of activity.

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