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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)