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Fair Value Measurements - Summary of Gains (Losses) on Foreign Currency Derivatives (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2026	Mar. 31, 2025
Foreign Exchange Contract [Member] | Not Designated as Hedging Instrument [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign currency derivative gains (losses)	$ (3)	$ 12	$ (2)	$ (3)

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Amount, before tax, of realized and unrealized gain (loss) from foreign currency transaction.

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