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Financial Derivative Instruments - Offsetting of Derivative Assets (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Offsetting Assets [Line Items]    
Gross amounts of recognized assets $ 538 $ 526
Fuel derivative contracts | Prepaid expenses and other current assets    
Offsetting Assets [Line Items]    
Gross amounts of recognized assets 292 352
Gross amounts offset in the Balance Sheet (98) (106)
Net amounts of assets presented in the Balance Sheet $ 194 $ 246
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 Assets [Line Items]    
Gross amounts of recognized assets $ 223 $ 160
Gross amounts offset in the Balance Sheet (30) 0
Net amounts of assets presented in the Balance Sheet $ 193 $ 160
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Other assets Other assets
Interest rate derivative contracts    
Offsetting Assets [Line Items]    
Net amounts of assets presented in the Balance Sheet $ 23 $ 14
Interest rate derivative contracts | Other assets    
Offsetting Assets [Line Items]    
Gross amounts of recognized assets 23 14
Gross amounts offset in the Balance Sheet $ 0 $ 0
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Other assets Other assets