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Fair Value Measurements - Summary of Net Losses on Commodity Derivatives (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2025
Mar. 31, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Cost of Revenue Cost of Revenue Cost of Revenue Cost of Revenue
Commodity Derivatives [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Commodity derivative losses $ 0 $ (2) $ (1) $ (3)