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Fair Value Measurements - Assets and Liabilities Measured at Fair Value (Details) - Recurring - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Fair value measurements    
Cash equivalents $ 50 $ 15
Other current assets (investments) 0 0
Total Assets 51 15
Total Liabilities (38) (65)
Other derivative agreements    
Fair value measurements    
Other current assets (commodity derivatives) 1  
Other current liabilities (other derivative agreements) (27) (64)
Biofuels blending obligation    
Fair value measurements    
Other liabilities (biofuel blending obligation) (11) (1)
Level 1    
Fair value measurements    
Cash equivalents 50 15
Other current assets (investments) 0 0
Total Assets 50 15
Total Liabilities 0 0
Level 1 | Other derivative agreements    
Fair value measurements    
Other current assets (commodity derivatives) 0  
Other current liabilities (other derivative agreements) 0 0
Level 1 | Biofuels blending obligation    
Fair value measurements    
Other liabilities (biofuel blending obligation) 0 0
Level 2    
Fair value measurements    
Cash equivalents 0 0
Other current assets (investments) 0 0
Total Assets 1 0
Total Liabilities (38) (65)
Level 2 | Other derivative agreements    
Fair value measurements    
Other current assets (commodity derivatives) 1  
Other current liabilities (other derivative agreements) (27) (64)
Level 2 | Biofuels blending obligation    
Fair value measurements    
Other liabilities (biofuel blending obligation) (11) (1)
Level 3    
Fair value measurements    
Cash equivalents 0 0
Other current assets (investments) 0 0
Total Assets 0 0
Total Liabilities 0 0
Level 3 | Other derivative agreements    
Fair value measurements    
Other current assets (commodity derivatives) 0  
Other current liabilities (other derivative agreements) 0 0
Level 3 | Biofuels blending obligation    
Fair value measurements    
Other liabilities (biofuel blending obligation) $ 0 $ 0