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Fair Value Measurements, Investments and Notes Receivable - Narrative (Details) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2023 aircraft | Dec. 31, 2022 USD ($) aircraft regional_carrier
Fair Value [Line Items] |  |
Number of regional carriers | regional_carrier |  | 3
Investments in securities accounted for under the equity method | $ |  | $ 188
Carrying amount of loan receivable | $ |  | $ 101
Champlain |  |
Fair Value [Line Items] |  |
Number of regional aircraft |  | 63
Republic |  |
Fair Value [Line Items] |  |
Number of regional aircraft |  | 66
Champlain |  |
Fair Value [Line Items] |  |
Ownership stake |  | 40.00%
Republic |  |
Fair Value [Line Items] |  |
Ownership stake |  | 19.00%
Mesa Air Group, Inc. | Subsequent Event |  |
Fair Value [Line Items] |  |
Number of regional aircraft | 63 |
Ownership stake | 10.00% |
Potential number of aircraft operated | 80 |
Fulcrum BioEnergy, Inc., Boom, Alder Fuels LLC, Heart Aerospace Incorporated and ZeroAvia, Inc. |  |
Fair Value [Line Items] |  |
Carrying value of other investment | $ |  | $ 434

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI https://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571 + Details
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