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Derivative Financial Instruments, Investments and Fair Value Measurements - Assets and Liabilities Measured at Fair Value (Details) - USD ($)
$ in Millions
Jun. 30, 2022
Dec. 31, 2021
Fair value measurements    
Other current liabilities (derivative financial instruments) $ (20) $ (2)
Recurring    
Fair value measurements    
Total assets 5 1
Long-term debt and finance lease obligations, net of current portion (long-term debt)   (1,620)
Total liabilities (2,120) (2,116)
Recurring | Long-term debt and finance lease obligations    
Fair value measurements    
Long-term debt and finance lease obligations, net of current portion (long-term debt) (1,392)  
Recurring | Derivative Financial Instruments, Liabilities    
Fair value measurements    
Other current liabilities (derivative financial instruments)   (2)
Recurring | Derivative Financial Instruments, Liabilities | Other current liabilities    
Fair value measurements    
Other current liabilities (derivative financial instruments) (20)  
Recurring | RFS Obligation    
Fair value measurements    
Other current liabilities (RFS obligations)   (494)
Recurring | RFS Obligation | Other current liabilities    
Fair value measurements    
Other current liabilities (RFS obligations) (708)  
Recurring | Derivative Financial Instruments, Assets    
Fair value measurements    
Other current assets (derivative financial instruments)   1
Recurring | Derivative Financial Instruments, Assets | Other current assets    
Fair value measurements    
Other current assets (derivative financial instruments) 5  
Recurring | Level 1    
Fair value measurements    
Total assets 0 0
Long-term debt and finance lease obligations, net of current portion (long-term debt)   0
Total liabilities 0 0
Recurring | Level 1 | Long-term debt and finance lease obligations    
Fair value measurements    
Long-term debt and finance lease obligations, net of current portion (long-term debt) 0  
Recurring | Level 1 | Derivative Financial Instruments, Liabilities    
Fair value measurements    
Other current liabilities (derivative financial instruments)   0
Recurring | Level 1 | Derivative Financial Instruments, Liabilities | Other current liabilities    
Fair value measurements    
Other current liabilities (derivative financial instruments) 0  
Recurring | Level 1 | RFS Obligation    
Fair value measurements    
Other current liabilities (RFS obligations)   0
Recurring | Level 1 | RFS Obligation | Other current liabilities    
Fair value measurements    
Other current liabilities (RFS obligations) 0  
Recurring | Level 1 | Derivative Financial Instruments, Assets    
Fair value measurements    
Other current assets (derivative financial instruments)   0
Recurring | Level 1 | Derivative Financial Instruments, Assets | Other current assets    
Fair value measurements    
Other current assets (derivative financial instruments) 0  
Recurring | Level 2    
Fair value measurements    
Total assets 5 1
Long-term debt and finance lease obligations, net of current portion (long-term debt)   (1,620)
Total liabilities (2,120) (2,116)
Recurring | Level 2 | Long-term debt and finance lease obligations    
Fair value measurements    
Long-term debt and finance lease obligations, net of current portion (long-term debt) (1,392)  
Recurring | Level 2 | Derivative Financial Instruments, Liabilities    
Fair value measurements    
Other current liabilities (derivative financial instruments)   (2)
Recurring | Level 2 | Derivative Financial Instruments, Liabilities | Other current liabilities    
Fair value measurements    
Other current liabilities (derivative financial instruments) (20)  
Recurring | Level 2 | RFS Obligation    
Fair value measurements    
Other current liabilities (RFS obligations)   (494)
Recurring | Level 2 | RFS Obligation | Other current liabilities    
Fair value measurements    
Other current liabilities (RFS obligations) (708)  
Recurring | Level 2 | Derivative Financial Instruments, Assets    
Fair value measurements    
Other current assets (derivative financial instruments)   1
Recurring | Level 2 | Derivative Financial Instruments, Assets | Other current assets    
Fair value measurements    
Other current assets (derivative financial instruments) 5  
Recurring | Level 3    
Fair value measurements    
Total assets 0 0
Long-term debt and finance lease obligations, net of current portion (long-term debt)   0
Total liabilities 0 0
Recurring | Level 3 | Long-term debt and finance lease obligations    
Fair value measurements    
Long-term debt and finance lease obligations, net of current portion (long-term debt) 0  
Recurring | Level 3 | Derivative Financial Instruments, Liabilities    
Fair value measurements    
Other current liabilities (derivative financial instruments)   0
Recurring | Level 3 | Derivative Financial Instruments, Liabilities | Other current liabilities    
Fair value measurements    
Other current liabilities (derivative financial instruments) 0  
Recurring | Level 3 | RFS Obligation    
Fair value measurements    
Other current liabilities (RFS obligations)   0
Recurring | Level 3 | RFS Obligation | Other current liabilities    
Fair value measurements    
Other current liabilities (RFS obligations) 0  
Recurring | Level 3 | Derivative Financial Instruments, Assets    
Fair value measurements    
Other current assets (derivative financial instruments)   $ 0
Recurring | Level 3 | Derivative Financial Instruments, Assets | Other current assets    
Fair value measurements    
Other current assets (derivative financial instruments) $ 0