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COMMITMENTS, CONTINGENCIES AND GUARANTEES - Narrative (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2024 USD ($) employee aircraft option | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
Commitments and Contingencies [Line Items] |  |  |
Carrying amount of loan receivable | $ 72 |  |
Liabilities due | $ 4,193 | $ 3,835 |
Number of call options to purchase regional jet aircraft | option | 207 |  |
Aggregate balance | $ 5,178 |  |
Tax-Exempt Special Facilities Revenue Bonds |  |  |
Commitments and Contingencies [Line Items] |  |  |
Underlying debt and interest | 2,900 |  |
Tax-Exempt Special Facilities Revenue Bonds | Indirect Guarantee of Indebtedness |  |  |
Commitments and Contingencies [Line Items] |  |  |
Underlying debt and interest | 504 |  |
Contingent liabilities based on participation | 2,700 |  |
Floating Rate Debt |  |  |
Commitments and Contingencies [Line Items] |  |  |
Long term debt | $ 8,500 |  |
Debt instrument, remaining terms | 12 years |  |
Loans And Leases From Non-U.S. Entities |  |  |
Commitments and Contingencies [Line Items] |  |  |
Debt instrument, remaining terms | 12 years |  |
Aggregate balance | $ 5,300 |  |
United Airlines, Inc. |  |  |
Commitments and Contingencies [Line Items] |  |  |
Liabilities due | $ 4,193 | 3,835 |
Number of employees | employee | 107,300 |  |
Percentage of employees represented by various U.S. labor organizations | 82.00% |  |
United Airlines, Inc. | Surety Bonds |  |  |
Commitments and Contingencies [Line Items] |  |  |
Contingent liabilities based on participation | $ 396 |  |
United Airlines, Inc. | Regional Aircraft | Capacity Purchase Agreements |  |  |
Commitments and Contingencies [Line Items] |  |  |
Expenses related to CPAs | 1,100 | 1,100 | $ 900
United Airlines, Inc. | Regional Aircraft | Capacity Purchase Agreements | Related Party |  |  |
Commitments and Contingencies [Line Items] |  |  |
Carrying amount of loan receivable | 52 | 84 |
Liabilities due | $ 110 | $ 122 |
United Airlines, Inc. | Cash Collateralized Letters of Credit |  |  |
Commitments and Contingencies [Line Items] |  |  |
Number of regional aircraft | aircraft | 412 |  |

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