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PENSION, POSTRETIREMENT AND OTHER EMPLOYEE BENEFIT PLANS - Allocation of Plan Assets (Details) - Pension Benefits	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Defined Benefit Plan Disclosure [Line Items]
Expected Long-Term Rate of Return	7.97%	7.53%
United Airlines, Inc. | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Expected Long-Term Rate of Return	9.00%
United Airlines, Inc. | Equity securities | Minimum
Defined Benefit Plan Disclosure [Line Items]
Percent of Total	27.00%
United Airlines, Inc. | Equity securities | Maximum
Defined Benefit Plan Disclosure [Line Items]
Percent of Total	55.00%
United Airlines, Inc. | Fixed-income securities
Defined Benefit Plan Disclosure [Line Items]
Expected Long-Term Rate of Return	7.00%
United Airlines, Inc. | Fixed-income securities | Minimum
Defined Benefit Plan Disclosure [Line Items]
Percent of Total	33.00%
United Airlines, Inc. | Fixed-income securities | Maximum
Defined Benefit Plan Disclosure [Line Items]
Percent of Total	61.00%
United Airlines, Inc. | Alternatives
Defined Benefit Plan Disclosure [Line Items]
Expected Long-Term Rate of Return	7.00%
United Airlines, Inc. | Alternatives | Minimum
Defined Benefit Plan Disclosure [Line Items]
Percent of Total	7.00%
United Airlines, Inc. | Alternatives | Maximum
Defined Benefit Plan Disclosure [Line Items]
Percent of Total	25.00%

X

- Definition

Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 8
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-8

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (k)(3)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

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Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 17
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480482/715-20-55-17

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

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