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Derivative Financial Instruments - Open Commodity Derivative Instruments (Details) - bbl bbl in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
2-1-1 Crack spreads
Derivative [Line Items]
Number of barrels	0	2
Distillate Crack spreads
Derivative [Line Items]
Number of barrels	0	1
Gasoline Crack spreads
Derivative [Line Items]
Number of barrels	0	1
Canadian crude oil
Derivative [Line Items]
Number of barrels	2	4

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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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X

- Details

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- Details

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