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Fair value measurements, investments and notes receivable - Narrative (Details) $ in Millions | 3 Months Ended
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Mar. 31, 2024 USD ($) aircraft
Fair Value [Line Items] |
Equity method investments | $ 230
Carrying amount of loan receivable | $ 86
Republic Airways Holdings Inc. |
Fair Value [Line Items] |
Number of aircraft operated | aircraft | 66
Champlain Enterprises LLC |
Fair Value [Line Items] |
Number of aircraft operated | aircraft | 53
Republic Airways Holdings Inc. |
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%
Fulcrum BioEnergy, Inc., Boom, Alder Fuels LLC, Heart Aerospace Incorporated and ZeroAvia, Inc. |
Fair Value [Line Items] |
Investment carrying value | $ 421
Corporate Debt | Maximum |
Fair Value [Line Items] |
Available-for-sale securities remaining maturities | 17 months

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