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Derivatives - Open Commodity Derivative Contracts (Details)
gal in Thousands, bbl in Thousands
3 Months Ended
Mar. 31, 2019
bbl
gal
Exchange Traded | Crude oil  
Derivative [Line Items]  
Percentage of derivative contracts expiring in the period 82.60%
Exchange Traded | Crude oil | Long  
Derivative [Line Items]  
Notional contracts (in thousands of Total Barrels) 49,844 [1]
Exchange Traded | Crude oil | Long | Spread Contracts  
Derivative [Line Items]  
Notional contracts (in thousands of Total Barrels) 11,999
Exchange Traded | Crude oil | Short  
Derivative [Line Items]  
Notional contracts (in thousands of Total Barrels) | gal 58,466 [1]
Exchange Traded | Crude oil | Short | Spread Contracts  
Derivative [Line Items]  
Notional contracts (in thousands of Total Barrels) 3,980
Exchange Traded | Refined products  
Derivative [Line Items]  
Percentage of derivative contracts expiring in the period 89.40%
Exchange Traded | Refined products | Long  
Derivative [Line Items]  
Notional contracts (in thousands of Total Barrels) 11,373 [1]
Exchange Traded | Refined products | Long | Spread Contracts  
Derivative [Line Items]  
Notional contracts (in thousands of Total Barrels) 300
Exchange Traded | Refined products | Short  
Derivative [Line Items]  
Notional contracts (in thousands of Total Barrels) | gal 9,945 [1]
Exchange Traded | Refined products | Short | Spread Contracts  
Derivative [Line Items]  
Notional contracts (in thousands of Total Barrels) 300
Exchange Traded | Blending products  
Derivative [Line Items]  
Percentage of derivative contracts expiring in the period 77.30%
Exchange Traded | Blending products | Long  
Derivative [Line Items]  
Notional contracts (in thousands of Total Barrels) 4,688 [1]
Exchange Traded | Blending products | Long | Spread Contracts  
Derivative [Line Items]  
Notional contracts (in thousands of Total Barrels) 2,603
Exchange Traded | Blending products | Short  
Derivative [Line Items]  
Notional contracts (in thousands of Total Barrels) | gal 4,866 [1]
Exchange Traded | Blending products | Short | Spread Contracts  
Derivative [Line Items]  
Notional contracts (in thousands of Total Barrels) 2,506
Over the Counter | Crude oil  
Derivative [Line Items]  
Percentage of derivative contracts expiring in the period 0.00%
Over the Counter | Crude oil | Long  
Derivative [Line Items]  
Notional contracts (in thousands of Total Barrels) 640
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 0.00%
Over the Counter | Blending products | Long  
Derivative [Line Items]  
Notional contracts (in thousands of Total Barrels) 1,676
Over the Counter | Blending products | Short  
Derivative [Line Items]  
Notional contracts (in thousands of Total Barrels) | gal 1,444
[1] Included in exchange-traded are spread contracts in thousands of barrels: Crude oil - 11,999 long and 3,980 short; Refined products - 300 long and 300 short; Blending products - 2,603 long and 2,506 short