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Employee Retirement Plan (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
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%
Percentage of Eligible Pre-tax Profits the Company Contributes to Profit Sharing until the Pre-tax Margin is 18%	10.00%
Employee retirement plan (Textual) [Abstract]
Percentage of compensation in cash	100.00%
Percentage of employees' pay	5.00%
Years of service	3 years
Percentage of employee's pay for profit sharing match	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	15.00%
Pilots Retirement Vesting Period	3 years
Defined Contribution Plan, Cost	$ 196	$ 172	$ 182

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- Definition

Defined contribution plan requisite service period for vesting.

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- Definition

Employee retirement plan.

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- Definition

Percentage of employees' gross pay for which the employer can contribute a discretionary profit sharing contribution to the Plan.

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- Definition

Percentage of Company contribution to Pilots Retirement Program based on eligible pilot compensation

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- Definition

Percentage of Eligible Pre-tax Profits the Company Contributes to Profit Sharing until the Pre-tax Margin is 18%

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- Definition

Percentage of Eligible Pre-tax Profits the Company Contributes to Profit Sharing when Pre-tax Margin is above 18%

+ References

No definition available.

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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.

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- Definition

Vesting period for company matching contributions relating to pilots retirement program

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- Definition

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- Definition

Retirement Plus Contribution Plan Requisite Service Period for Vesting

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- Definition

Amount of cost for defined contribution plan.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-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

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- Definition

Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

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Percentage employer matches of the employee's percentage contribution matched.

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