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Commitments and Contingencies - Narrative (Details)
$ in Millions
 1 Months Ended 3 Months Ended 9 Months Ended
Jan. 31, 2023
USD ($)
Sep. 30, 2024
USD ($)
Sep. 30, 2023
USD ($)
Sep. 30, 2024
USD ($)
Sep. 30, 2023
USD ($)
Feb. 28, 2023
lawsuit
Dec. 31, 2022
lawsuit
Jul. 14, 2022
pilot_instructor
Unrecorded Unconditional Purchase Obligation [Line Items]                
Restricted assets pledged under letter of credit   $ 72   $ 72        
Letters of credit   59   59        
Restricted assets pledged related to workers compensation insurance policies and other business partner agreements   $ 9   $ 9        
Percentage of employees represented by unions under collective bargaining agreements   52.00%   52.00%        
Percentage of employees represented by unions under collective bargaining agreements, will become amendable within one year   23.00%   23.00%        
Collective bargaining agreement contract extension period 2 years              
One-time bonus payment $ 95              
Union contract costs $ 26 $ 26 $ 8 $ 26 $ 104      
Number of flight instructor | pilot_instructor               35
Employment agreement term       5 years        
Automatic renewal term, employment agreement, term       5 years        
Renewal notice period, employment agreement, period       90 days        
Loss contingency, pending claims, number | lawsuit           4 4  
JFK Millennium Partner LLC                
Unrecorded Unconditional Purchase Obligation [Line Items]                
Letters of credit   $ 65   $ 65        
Ownership percentage   5.00%   5.00%