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Investments and Fair Value Measurements - Narrative (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 USD ($) aircraft | Dec. 29, 2021
Fair Value [Line Items] |  |
Investments in securities accounted for under the equity method | $ 171 |
Champlain |  |
Fair Value [Line Items] |  |
Number of regional aircraft | aircraft | 75 |
Republic |  |
Fair Value [Line Items] |  |
Number of regional aircraft | aircraft | 66 |
Champlain |  |
Fair Value [Line Items] |  |
Ownership stake | 40.00% |
Republic |  |
Fair Value [Line Items] |  |
Ownership stake | 19.00% |
ManaAir |  |
Fair Value [Line Items] |  |
Ownership stake | 49.90% |
AVG |  |
Fair Value [Line Items] |  |
Ownership stake |  | 16.40%
Carrying value of other investment | $ 164 |
Fulcrum BioEnergy, Inc., Boom, Alder Fuels LLC, Heart Aerospace Incorporated and ZeroAvia, Inc. |  |
Fair Value [Line Items] |  |
Carrying value of other investment | $ 84 |

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