v3.24.0.1
Crewmember Retirement Plan (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Jan. 01, 2021
Jan. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Percentage of compensation in cash     100.00%    
Percentage of employees' pay     5.00%    
Years of service     3 years    
Percentage of company contribution to pilots retirement program 16.00%        
Pilots retirement vesting period     3 years    
Percentage of eligible pre-tax profits the company contributes to profit sharing until the pre-tax margin is 18%     10.00%    
Profit sharing calculation trigger, pretax margin     18.00%    
Percentage of eligible pre-tax profits the company contributes to profit sharing when pre-tax margin is above 18%     20.00%    
Defined contribution plan, cost     $ 271 $ 249 $ 213
Retirement Plus          
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Percentage of employees' pay     5.00%    
Years of service     3 years    
Retirement Advantage          
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Percentage of employees' pay     3.00%    
Subsequent Event | Retirement Non-elective Crewmember          
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Percentage of employees' pay   5.00%      
Years of service   3 years      
Percentage of increase in pay   5.00%      
Subsequent Event | Retirement Non-elective Licensed          
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Percentage of employees' pay   8.00%      
Years of service   3 years