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Long-Term Debt and Finance Lease Obligations - Petroleum Segment (Details) - USD ($) $ in Millions |  |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Jul. 25, 2025 | Jun. 30, 2025 | Sep. 30, 2025 | Jun. 30, 2025 | Sep. 30, 2025 | Sep. 30, 2024
Line of Credit Facility [Line Items] |  |  |  |  |  |
Repayments of senior debt |  |  |  |  | $ 0 | $ 600
Term Loan | Petroleum Segment |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Repayments of senior debt | $ 20 | $ 70 |  |  |  |
Loss on extinguishment of debt |  |  | $ 1 | $ 1 |  |

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