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Derivative Financial Instruments - Schedule of Gains (Losses) on Derivatives (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2018 USD ($) derivative | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gain (loss) on derivatives, net | $ 146 | $ (70) | $ (19)
Forward purchases |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gain (loss) on derivatives, net | $ 103 | (26) | 0
Forward Contracts, 2019 RINs |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Outstanding positions | derivative | 27,000,000 |  |
Forward purchase price | $ 4 |  |
Forward Contracts, 2018 RINs |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Outstanding positions | derivative | 8,000,000 |  |
Forward purchase price | $ 3 |  |
Swaps |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gain (loss) on derivatives, net | $ 44 | (43) | (19)
Commodity Swap |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Outstanding positions | derivative | 0 |  |
Futures |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gain (loss) on derivatives, net | $ (1) | $ (1) | $ 0

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