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Fair Value Measurements - Additional Information (Details) - USD ($)
3 Months Ended 6 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2025
Mar. 31, 2024
Sep. 30, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Impairment charges $ 2,000,000 $ 0 $ 3,000,000 $ 1,000,000  
Level 2 measurement          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Fair value of debt $ 4,112,000,000   $ 4,112,000,000   $ 3,836,000,000