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Derivative Financial Instruments - Open Commodity Derivative Instruments (Details) - bbl bbl in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
2-1-1 Crack spreads |  |
Derivative [Line Items] |  |
Number of barrels | 0 | 7
Distillate Crack spreads |  |
Derivative [Line Items] |  |
Number of barrels | 0 | 4
Gasoline Crack spreads |  |
Derivative [Line Items] |  |
Number of barrels | 0 | 4
Canadian crude oil |  |
Derivative [Line Items] |  |
Number of barrels | 2 | 6

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Nominal volume used to calculate payments on a derivative instrument. + References No definition available. + Details
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- Details
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- Details
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- Details
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- Details
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