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Crewmember Retirement Plan (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Retirement Benefits [Abstract]    
Defined Contribution Plan, Employer Matching Contribution, Percent of Match 100.00%  
Percentage of employees' gross pay for which the employer contributes a matching contribution to the Plan. 5.00%  
Defined Contribution Plan Requisite Service Period 3 years  
Percentage of employees' gross pay for which the employer can contribute a discretionary profit sharing contribution to the Plan. 5.00%  
Retirement Plus Contribution Plan Requisite Service Period for Vesting 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 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 $ 52 $ 49