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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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