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Financial Instruments and Fair Value Measurements - Narrative (Details) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2023 USD ($) aircraft | Mar. 31, 2023 USD ($)
Fair Value [Line Items] |  |
Equity method investments | $ 214 |
CommuteAir LLC |  |
Fair Value [Line Items] |  |
Ownership stake | 40.00% |
Number of aircraft operated | aircraft | 56 |
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 | $ 417 |
Corporate Debt | Maximum |  |
Fair Value [Line Items] |  |
Available-for-sale securities remaining maturities | 2 years |

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