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Commitments and Contingencies - Renewable Fuel Standards (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Petroleum Segment | EHS |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Expense of renewable identification numbers expense | $ 21 | $ 50 | $ 33 | $ 27

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- Definition Represents the expense incurred for the purchase of Renewable Identification Numbers. + References No definition available. + Details
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- Details
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