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PENSION, POSTRETIREMENT AND OTHER EMPLOYEE BENEFIT PLANS - Narrative (Details) $ in Millions | 12 Months Ended
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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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- Definition 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 + Details
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