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Crewmember Retirement Plan (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended		9 Months Ended
	Jan. 31, 2024	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Percentage of employees pay (in percent)				100.00%
Crewmember contribution percentage (in percent)				5.00%
Percentage of compensation in cash				3 years
Percentage of company contribution to pilots retirement program				16.00%
Pilots retirement vesting period				3 years
Defined contribution plan, cost		$ 68	$ 75	$ 195	$ 213
Retirement Advantage
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Crewmember contribution percentage (in percent)				3.00%
Retirement Non-elective Licensed
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Crewmember contribution percentage (in percent)	8.00%
Percentage of compensation in cash	3 years
Retirement Non-elective Crewmember
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Crewmember contribution percentage (in percent)	5.00%

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- Definition

Defined Contribution Plan Requisite Service Period For Vesting

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- Definition

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

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- Definition

Vesting period for company matching contributions relating to pilots retirement program

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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- Definition

Amount of cost for defined contribution plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 70
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480794/715-70-50-1

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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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- Definition

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

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