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Crewmember Retirement Plan (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 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 | $ 42 | $ 50 | $ 135 | $ 148

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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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- Definition Percentage of FAA licensed employees gross pay for which ER can contribute discretionary profit sharing contribution to plan + References No definition available. + Details
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- Definition Amount of cost for defined contribution plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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