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Commitments and Contingencies - Clean Air Act Matter, Renewable Fuel Standards, and Environmental Remediation (Details) - EHS $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 USD ($) count | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Loss Contingencies [Line Items] |  |  |  |
Environmental accruals | $ 11 | $ 11 | $ 6 |
Petroleum Segment |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Expense for compliance with RFS |  | 190 | 43 | $ 60
RFS obligation | $ 214 | $ 214 | $ 7 |
CRRM | Clean Air Act Matter |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Number of counts asserted related to alleged violations | count | 9 |  |  |

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