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Crewmember Retirement Plan (Details) - USD ($) $ in Millions		12 Months Ended
	Jan. 01, 2021	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Retirement Benefits [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	16.00%	15.00%
Pilots retirement vesting period		3 years
Percentage 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%
Defined contribution plan, cost		$ 249	$ 213	$ 177

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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 FAA licensed employees gross pay for which ER can contribute discretionary profit sharing contribution to plan

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Amount of cost for defined contribution plan.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 70
-Section 50
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942

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