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Derivative Financial Instruments, Investments and Fair Value Measurements - Assets and Liabilities Measured at Fair Value (Details) - Recurring - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Prepaid expenses and other current assets (investments) $ 173  
Total Assets 173  
Current portion of long-term debt (2)  
Long-term debt and finance lease obligations, net of current portion (1,604) $ (1,180)
Total Liabilities (1,837) (1,195)
Commodity derivatives    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other current liabilities (commodity derivatives) (17) (8)
RFS obligation    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other current liabilities (RFS obligation) (214) (7)
Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Prepaid expenses and other current assets (investments) 173  
Total Assets 173  
Current portion of long-term debt 0  
Long-term debt and finance lease obligations, net of current portion 0 0
Total Liabilities 0 0
Level 1 | Commodity derivatives    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other current liabilities (commodity derivatives) 0 0
Level 1 | RFS obligation    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other current liabilities (RFS obligation) 0 0
Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Prepaid expenses and other current assets (investments) 0  
Total Assets 0  
Current portion of long-term debt (2)  
Long-term debt and finance lease obligations, net of current portion (1,604) (1,180)
Total Liabilities (1,837) (1,195)
Level 2 | Commodity derivatives    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other current liabilities (commodity derivatives) (17) (8)
Level 2 | RFS obligation    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other current liabilities (RFS obligation) (214) (7)
Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Prepaid expenses and other current assets (investments) 0  
Total Assets 0  
Current portion of long-term debt 0  
Long-term debt and finance lease obligations, net of current portion 0 0
Total Liabilities 0 0
Level 3 | Commodity derivatives    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other current liabilities (commodity derivatives) 0 0
Level 3 | RFS obligation    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other current liabilities (RFS obligation) $ 0 $ 0