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Crewmember Retirement Plan (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 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 $ 41 $ 49 $ 92 $ 98