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Fair Value Measurements - Additional Information (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Sep. 30, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Net assets measured at fair value on a recurring basis $ 3,200 $ 3,100
Net Derivative Assets [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs $ (0) $ (1)