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Fair Value Measurements - Fair Value Measurements Using Significant Unobservable Inputs (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Sep. 30, 2024
--- | --- | ---
Fair Value Measurements |  |
Commodity contract derivatives, assets | $ 16 | $ 7
Commodity contract derivatives, liabilities | 6 | 5
Fair Value, Inputs, Level 3 |  |
Fair Value Measurements |  |
Commodity contract derivatives, assets | 0 | 0
Commodity contract derivatives, liabilities | $ 0 | $ 0

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