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Fair Value Measurements - Summary of Gains and Losses on Foreign Currency Derivatives (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Mar. 31, 2025 | Mar. 31, 2024
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) | $ 12 | $ (2) | $ (3) | $ 1

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