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FAIR VALUE MEASUREMENTS, INVESTMENTS AND NOTES RECEIVABLE - Narrative (Details) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2025 USD ($) aircraft | Apr. 04, 2025
Fair Value [Line Items] |  |
Equity method investments | $ 249 |
Carrying amount of loan receivable | $ 79 |
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 LLC |  |
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 value | $ 262 |
New Surviving Entity | Maximum | Scenario, Plan | Subsequent Event |  |
Fair Value [Line Items] |  |
Equity interests exchanged for commitment to facilitate merger transaction |  | 6.00%
Mesa |  |
Fair Value [Line Items] |  |
Variable interest | 10.00% |
Corporate debt |  |
Fair Value [Line Items] |  |
Available-for-sale securities remaining maturities | 2 years |

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