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Commitments and Contingencies - Renewable Fuel Standard (Details) $ in Millions |  | 3 Months Ended | 9 Months Ended | 60 Months Ended
--- | --- | --- | --- | ---
Aug. 22, 2025 | Sep. 30, 2025 USD ($) | Sep. 30, 2024 USD ($) | Sep. 30, 2025 USD ($) | Sep. 30, 2024 USD ($) | Dec. 31, 2024 USD ($)
Loss Contingencies [Line Items] |  |  |  |  |  |
Waiver percentage, year one | 1 |  |  |  |  |
Waiver percentage, year three | 1 |  |  |  |  |
Waiver percentage, year two | 0.50 |  |  |  |  |
Waiver percentage, year four | 0.50 |  |  |  |  |
Waiver percentage, year five | 0.50 |  |  |  |  |
Waiver percentage, year six | 0.50 |  |  |  |  |
RIN oblication, reduced |  |  |  |  |  | $ 424
Increase (decrease) accrued obligation |  | $ (488) |  | $ (488) |  |
Petroleum Segment | Environmental, Health, and Safety Matters |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Expense (benefit) for compliance with RFS |  | (417) | $ 86 | (171) | $ 65 |
RFS obligation |  | $ 93 |  | $ 93 |  | $ 323

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