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Commitments and Contingencies - Narrative (Details)
$ in Millions
 1 Months Ended 3 Months Ended
Jan. 31, 2023
USD ($)
Mar. 31, 2024
USD ($)
Dec. 31, 2023
lawsuit
Feb. 28, 2023
lawsuit
Jul. 14, 2022
pilot_instructor
Unrecorded Unconditional Purchase Obligation [Line Items]          
Restricted assets pledged under letter of credit   $ 59      
Letters of credit   65      
Restricted assets pledged related to workers compensation insurance policies and other business partner agreements   $ 32      
Percentage of employees represented by unions under collective bargaining agreements   52.00%      
Percentage of employees represented by unions under collective bargaining agreements, will become amendable within one year   22.00%      
Collective bargaining agreement contract extension period 2 years        
One-time bonus payment $ 95        
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]          
Ownership percentage   5.00%