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FAIR VALUE MEASUREMENTS, INVESTMENTS AND NOTES RECEIVABLE - Narrative (Details) $ in Millions |  | 9 Months Ended |
--- | --- | --- | ---
May 28, 2025 USD ($) | Sep. 30, 2025 USD ($) aircraft | Apr. 04, 2025
Fair Value [Line Items] |  |  |
Equity method investments |  | $ 265 |
Carrying amount of loan receivable |  | $ 75 |
Republic Airways |  |  |
Fair Value [Line Items] |  |  |
Number of aircraft operated | aircraft |  | 66 |
Champlain Enterprises LLC |  |  |
Fair Value [Line Items] |  |  |
Number of aircraft operated | aircraft |  | 59 |
Republic Airways |  |  |
Fair Value [Line Items] |  |  |
Ownership stake |  | 19.00% |
CommuteAir |  |  |
Fair Value [Line Items] |  |  |
Ownership stake |  | 40.00% |
United Airlines Ventures Sustainable Flight Fund |  |  |
Fair Value [Line Items] |  |  |
Ownership stake |  | 33.00% |
Other Equity Investments |  |  |
Fair Value [Line Items] |  |  |
Investment carrying amount |  | $ 286 |
New Surviving Entity | Scenario, Plan | Maximum |  |  |
Fair Value [Line Items] |  |  |
Equity interests exchanged for commitment to facilitate merger transaction |  |  | 6.00%
Mesa |  |  |
Fair Value [Line Items] |  |  |
Variable interest |  | 10.00% |
Azul |  |  |
Fair Value [Line Items] |  |  |
Potential equity investments in connection with reorganization process | $ 300 |  |
Corporate debt |  |  |
Fair Value [Line Items] |  |  |
Available-for-sale securities remaining maturities |  | 2 years |

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