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Fair Value Measurements, Investments and Notes Receivable - Narrative (Details) $ in Millions | 9 Months Ended
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Sep. 30, 2024 USD ($) aircraft
Fair Value [Line Items] |
Equity method investments | $ 235
Carrying amount of loan receivable | $ 85
Republic Airways Holdings Inc. |
Fair Value [Line Items] |
Number of aircraft operated | aircraft | 65
Champlain Enterprises LLC |
Fair Value [Line Items] |
Number of aircraft operated | aircraft | 55
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 | $ 344
Corporate Debt | Maximum |
Fair Value [Line Items] |
Available-for-sale securities remaining maturities | 2 years

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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 323 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481687/323-10-50-3 + Details
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- Definition Amortized cost excluding accrued interest, after allowance for credit loss, of financing receivable. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479344/326-20-45-1 + Details
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