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Commitments and Contingencies - RFS (Details) - Petroleum Segment - Environmental, Health, and Safety Matters - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Loss Contingencies [Line Items] |  |  |  |  |
Expense for compliance with RFS | $ 173 | $ 16 | $ 351 | $ 35 |
RFS obligation | $ 485 |  | $ 485 |  | $ 214

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- Definition Expense (Benefit) for Compliance with Renewable Fuel Standard + References No definition available. + Details
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- Definition Renewable Fuel Standards Obligation, Current + References No definition available. + Details
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- Details
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- Details
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