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Financial Derivative Instruments - Offsetting Derivative Liabilities (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Offsetting Liabilities [Line Items]    
Gross amounts of recognized liabilities $ 28 $ 0
Fuel derivative contracts | Prepaid expenses and other current assets    
Offsetting Liabilities [Line Items]    
Gross amounts of recognized liabilities 98 106
Gross amounts offset in the Balance Sheet (98) (106)
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 $ 30 $ 0
Gross amounts offset in the Balance Sheet (30) 0
Net amounts of liabilities presented in the Balance Sheet $ 0 $ 0
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Other assets Other assets