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Derivative Financial Instruments - Schedule of Gains (Losses) on Derivatives (Details) $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2019 USD ($) derivative | Jun. 30, 2018 USD ($) | Jun. 30, 2019 USD ($) derivative | Jun. 30, 2018 USD ($)
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Total gain on derivatives, net | $ 4 | $ 10 | $ 20 | $ 70
Forward purchases |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Total gain on derivatives, net | $ 3 | 13 | $ 20 | 28
Forward Contracts, RINs |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Outstanding positions | derivative | 34,000,000 |  | 34,000,000 |
Swaps |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Total gain on derivatives, net | $ 0 | (2) | $ 0 | 44
Commodity Swap |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Outstanding positions | derivative | 0 |  | 0 |
Futures |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Total gain on derivatives, net | $ 1 | $ (1) | $ 0 | $ (2)

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