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PENSION, POSTRETIREMENT AND OTHER EMPLOYEE BENEFIT PLANS - Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($) plan	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Schedule Of Defined Benefit Plans And Defined Contribution Plans Disclosures [Line Items]
Number of defined benefit pension plans | plan	2
Profit sharing and payroll tax expense	$ 713	$ 681	$ 133
United Airlines, Inc.
Schedule Of Defined Benefit Plans And Defined Contribution Plans Disclosures [Line Items]
Expense for defined contribution plans	$ 1,200	$ 960	$ 756
United Airlines, Inc. | Minimum
Schedule Of Defined Benefit Plans And Defined Contribution Plans Disclosures [Line Items]
Employer contribution percentage	1.00%
United Airlines, Inc. | Maximum
Schedule Of Defined Benefit Plans And Defined Contribution Plans Disclosures [Line Items]
Employer contribution percentage	17.00%
Pension Benefits
Schedule Of Defined Benefit Plans And Defined Contribution Plans Disclosures [Line Items]
Anticipated contributions	$ 141
Other Postretirement Benefits
Schedule Of Defined Benefit Plans And Defined Contribution Plans Disclosures [Line Items]
Anticipated contributions	$ 80

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Defined Benefit Plan Profit Sharing And Payroll Tax Expense

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Number Of Defined Benefit Pension Plans

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Amount of contribution expected to be received by defined benefit plan from employer in next fiscal year following current fiscal year.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 18
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480482/715-20-55-18

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (g)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

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Amount of discretionary contributions made by an employer to a defined contribution plan.

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