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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 |

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- Definition Percentage of employees' gross pay for which the employer can contribute a discretionary profit sharing contribution to the Plan. + References No definition available. + Details
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