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Financial Derivative Instruments - Offsetting Derivative Liabilities (Details) - USD ($)
$ in Millions
Sep. 30, 2022
Dec. 31, 2021
Offsetting Liabilities [Line Items]    
Gross amounts of recognized liabilities $ 29 $ 4
Fuel derivative contracts | Prepaid expenses and other current assets    
Offsetting Liabilities [Line Items]    
Gross amounts of recognized liabilities 125 80
Gross amounts offset in the Balance Sheet (125) (80)
Net amounts of liabilities presented in the Balance Sheet $ 0 $ 0
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Prepaid expenses and other current assets Prepaid expenses and other current assets
Fuel derivative contracts | Other assets    
Offsetting Liabilities [Line Items]    
Gross amounts of recognized liabilities $ 38 $ 95
Gross amounts offset in the Balance Sheet (38) (95)
Net amounts of liabilities presented in the Balance Sheet $ 0 $ 0
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Other assets Other assets
Interest rate derivative contracts    
Offsetting Liabilities [Line Items]    
Net amounts of liabilities presented in the Balance Sheet $ 0 $ 4
Interest rate derivative contracts | Other noncurrent liabilities    
Offsetting Liabilities [Line Items]    
Gross amounts of recognized liabilities 0 4
Gross amounts offset in the Balance Sheet $ 0 $ 0
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Other noncurrent liabilities Other noncurrent liabilities