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Crewmember Retirement Plan (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 29 Months Ended
Jan. 01, 2021
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Retirement Benefits [Abstract]            
Percentage of employees pay       100.00%    
Percentage of employees' gross pay       5.00%    
Contribution vesting period       3 years    
Discretionary contribution       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       3.00%    
Percentage of company contribution to pilots retirement program 16.00%         15.00%
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%       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%    
Contribution to employee retirement plan   $ 57 $ 42 $ 157 $ 135