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Derivatives - Open Commodity Derivative Contracts (Details) gal in Thousands, bbl in Thousands	9 Months Ended
	Sep. 30, 2019 bbl gal
Exchange Traded | Crude oil
Derivative [Line Items]
Percentage of derivative contracts expiring in the period	92.10%
Exchange Traded | Crude oil | Long
Derivative [Line Items]
Notional contracts (in thousands of Total Barrels)	35,825	[1]
Exchange Traded | Crude oil | Long | Spread Contracts
Derivative [Line Items]
Notional contracts (in thousands of Total Barrels)	6,520
Exchange Traded | Crude oil | Short
Derivative [Line Items]
Notional contracts (in thousands of Total Barrels) | gal	40,897	[1]
Exchange Traded | Crude oil | Short | Spread Contracts
Derivative [Line Items]
Notional contracts (in thousands of Total Barrels)	1,500
Exchange Traded | Refined products
Derivative [Line Items]
Percentage of derivative contracts expiring in the period	97.10%
Exchange Traded | Refined products | Long
Derivative [Line Items]
Notional contracts (in thousands of Total Barrels)	17,014	[1]
Exchange Traded | Refined products | Long | Spread Contracts
Derivative [Line Items]
Notional contracts (in thousands of Total Barrels)	925
Exchange Traded | Refined products | Short
Derivative [Line Items]
Notional contracts (in thousands of Total Barrels) | gal	11,258	[1]
Exchange Traded | Refined products | Short | Spread Contracts
Derivative [Line Items]
Notional contracts (in thousands of Total Barrels)	225
Exchange Traded | Blending products
Derivative [Line Items]
Percentage of derivative contracts expiring in the period	84.20%
Exchange Traded | Blending products | Long
Derivative [Line Items]
Notional contracts (in thousands of Total Barrels)	2,750	[1]
Exchange Traded | Blending products | Long | Spread Contracts
Derivative [Line Items]
Notional contracts (in thousands of Total Barrels)	257
Exchange Traded | Blending products | Short
Derivative [Line Items]
Notional contracts (in thousands of Total Barrels) | gal	7,708	[1]
Exchange Traded | Blending products | Short | Spread Contracts
Derivative [Line Items]
Notional contracts (in thousands of Total Barrels)	182
Over the Counter | Crude oil
Derivative [Line Items]
Percentage of derivative contracts expiring in the period	100.00%
Over the Counter | Crude oil | Long
Derivative [Line Items]
Notional contracts (in thousands of Total Barrels)	160
Over the Counter | Crude oil | Short
Derivative [Line Items]
Notional contracts (in thousands of Total Barrels)	0
Over the Counter | Blending products
Derivative [Line Items]
Percentage of derivative contracts expiring in the period	100.00%
Over the Counter | Blending products | Long
Derivative [Line Items]
Notional contracts (in thousands of Total Barrels)	313
Over the Counter | Blending products | Short
Derivative [Line Items]
Notional contracts (in thousands of Total Barrels) | gal	313
[1] Included in exchange-traded are spread contracts in thousands of barrels: Crude oil - 6,520 long and 1,500 short; Refined products - 925 long and 225 short; Blending products - 257 long and 182 short

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Percentage Of Derivative Contracts Expiring in the following quarter.

+ References

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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.

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- Definition

Nominal number of units used to calculate payment on derivative.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5580258-113959

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959

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