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Crewmember Retirement Plan (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended
Jan. 01, 2021
Jan. 31, 2024
Mar. 31, 2024
Mar. 31, 2023
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Percentage of employees pay (in percent)     100.00%  
Crewmember contribution percentage (in percent)     5.00%  
Percentage of compensation in cash     3 years  
Percentage of company contribution to pilots retirement program 16.00%      
Pilots retirement vesting period     3 years  
Defined contribution plan, cost     $ 66 $ 66
Retirement Advantage        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Crewmember contribution percentage (in percent)     3.00%  
Retirement Non-elective Licensed        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Crewmember contribution percentage (in percent)   8.00%    
Percentage of compensation in cash   3 years    
Retirement Non-elective Crewmember        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Crewmember contribution percentage (in percent)   5.00%