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PENSION, POSTRETIREMENT AND OTHER EMPLOYEE BENEFIT PLANS - Allocation of Plan Assets (Details) - Pension Benefits | 12 Months Ended
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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% |

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- 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 + Details
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- Definition 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 + Details
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