v3.24.0.1
Financial Derivative Instruments and Risk Management - Hedging Effectiveness (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Fuel Costs    
Aircraft Fuel Derivatives      
Derivative Instruments, Gain (Loss) [Line Items]      
Hedge effectiveness gains (losses) recognized in aircraft fuel expense $ 7 $ (7) $ 0
Percentage of actual consumption economically hedged 25.00% 7.00% 0.00%
Aircraft Fuel Derivatives | Comprehensive Income      
Derivative Instruments, Gain (Loss) [Line Items]      
Hedge gains (losses) on derivatives recognized in comprehensive income $ 1 $ (3) $ 0