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Derivative Financial Instruments - Assets and Liabilities Measured at Fair Value (Details) - Recurring - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Fair value measurements    
Prepaid expenses and other current assets (investments) $ 3 $ 7
Total Assets 3 7
Total Liabilities (16) (2)
Renewable Fuel Standard RFS obligation    
Fair value measurements    
Other current liabilities (Renewable Fuel Standard “RFS” obligation) (16) (2)
Level 1    
Fair value measurements    
Prepaid expenses and other current assets (investments) 0 0
Total Assets 0 0
Total Liabilities 0 0
Level 1 | Renewable Fuel Standard RFS obligation    
Fair value measurements    
Other current liabilities (Renewable Fuel Standard “RFS” obligation) 0 0
Level 2    
Fair value measurements    
Prepaid expenses and other current assets (investments) 3 7
Total Assets 3 7
Total Liabilities (16) (2)
Level 2 | Renewable Fuel Standard RFS obligation    
Fair value measurements    
Other current liabilities (Renewable Fuel Standard “RFS” obligation) (16) (2)
Level 3    
Fair value measurements    
Prepaid expenses and other current assets (investments) 0 0
Total Assets 0 0
Total Liabilities 0 0
Level 3 | Renewable Fuel Standard RFS obligation    
Fair value measurements    
Other current liabilities (Renewable Fuel Standard “RFS” obligation) $ 0 $ 0