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Financial Instruments and Fair Value Measurements - Narrative (Details) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2023 USD ($) aircraft
Fair Value [Line Items] |
Equity method investments | $ 208
CommuteAir LLC |
Fair Value [Line Items] |
Ownership stake | 40.00%
Number of aircraft operated | aircraft | 61
Republic Airways Holdings Inc. |
Fair Value [Line Items] |
Ownership stake | 19.00%
Number of aircraft operated | aircraft | 66
United Airlines Ventures Sustainable Flight Fund |
Fair Value [Line Items] |
Ownership stake | 49.99%
Initial commitment | $ 100
Blue Blade Energy, LLC |
Fair Value [Line Items] |
Ownership stake | 20.00%
Fulcrum BioEnergy, Inc., Boom, Alder Fuels LLC, Heart Aerospace Incorporated and ZeroAvia, Inc. |
Fair Value [Line Items] |
Investment carrying value | $ 413
Corporate Debt | Maximum |
Fair Value [Line Items] |
Available-for-sale securities remaining maturities | 2 years

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