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Crewmember Retirement Plan (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Retirement Benefits [Abstract]        
Percentage of employees pay (in percent)     100.00%  
Crewmember contribution percentage (in percent)     5.00%  
Percentage of compensation in cash     3 years  
Percentage of employees' pay for profit sharing match (in percent)     5.00%  
Period of discretionary contribution     3 years  
Percentage of FAA licensed employees gross pay for which ER can contribute discretionary profit sharing contribution to plan (in percent)     3.00%  
Percentage of company contribution to pilots retirement program (in percent)     16.00%  
Pilots retirement vesting period     3 years  
Percent of eligible pre-tax profits the company contributes to profit sharing until the pre-tax margin is 18% (in percent)     10.00%  
Profit sharing calculation trigger, pretax margin (in percent)     18.00%  
Percentage of eligible pre-tax profits the company contributes to profit sharing when pre-tax margin is above 18% (in percent)     20.00%  
Contribution to employee retirement plan $ 72 $ 63 $ 138 $ 125