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Commitments and Contingencies - Additional Information (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2024
USD ($)
aircraft
employeeGroup
Jun. 30, 2024
USD ($)
employeeGroup
aircraft
engine
Dec. 31, 2023
USD ($)
Long-term Purchase Commitment [Line Items]      
Costs capitalized | $ $ 88 $ 88 $ 78
Litigation settlement, gain | $ $ 50    
Number of union-represented employee groups | employeeGroup 7 7  
Amount of employees represented by unions   88.00%  
Accrued liabilities for health care claims | $ $ 6 $ 6 $ 5
Aircraft Engine      
Long-term Purchase Commitment [Line Items]      
Number of aircraft agreed to purchase | engine   14  
Air Transportation Equipment      
Long-term Purchase Commitment [Line Items]      
Number of aircraft agreed to purchase   198  
Air Transportation Equipment | A320neo      
Long-term Purchase Commitment [Line Items]      
Number of aircraft agreed to purchase   49  
Number of aircraft eligible for conversion 18 18  
Air Transportation Equipment | A321neo      
Long-term Purchase Commitment [Line Items]      
Number of aircraft agreed to purchase   149