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COMMITMENTS, CONTINGENCIES, AND GUARANTEES - Narrative (Details) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 USD ($) employee aircraft | Jun. 30, 2025 USD ($) | Sep. 30, 2024 USD ($) | Sep. 30, 2025 USD ($) employee aircraft | Sep. 30, 2024 USD ($)
Commitments and Contingencies [Line Items] |  |  |  |  |
Special charges related to ratification payment | $ 0 | $ 561 | $ 0 | $ 561 | $ 0
United Airlines, Inc. |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |
Number of employees | employee | 111,900 |  |  | 111,900 |
Percentage of employees represented by various U.S. labor organizations |  |  |  | 82.00% |
Tax-Exempt Special Facilities Revenue Bonds |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |
Aggregate principal amount of guarantee | $ 2,900 |  |  | $ 2,900 |
Floating Rate Debt |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |
Carrying amount | 8,600 |  |  | $ 8,600 |
Remaining term of debt |  |  |  | 12 years |
Loans and Leases from Non-U.S. Entities |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |
Remaining term of debt |  |  |  | 12 years |
Aggregate balance | $ 5,500 |  |  | $ 5,500 |
Purchase commitments | Airbus A319 |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |
Number of aircrafts agreed to purchase between 2026 and 2029 | aircraft | 25 |  |  | 25 |

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