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Financial Instruments and Fair Value Measurements - Narrative (Details) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2021 USD ($) aircraft shares | Nov. 30, 2020 USD ($)
Fair Value [Line Items] |  |
Equity method investments | $ 152 |
Notes receivable | 120 |
Notes receivable, fair value | $ 41 |
Class A Clear Warrants |  |
Fair Value [Line Items] |  |
Number of securities called by warrants (in shares) | shares | 2,400,000 |
Archer Warrants |  |
Fair Value [Line Items] |  |
Number of securities called by warrants (in shares) | shares | 4,700,000 |
Boom Warrants |  |
Fair Value [Line Items] |  |
Number of securities called by warrants (in shares) | shares | 568,857 |
Carrying value of warrants | $ 17 |
Republic |  |
Fair Value [Line Items] |  |
Number of aircraft operated | aircraft | 66 |
Champlain |  |
Fair Value [Line Items] |  |
Number of aircraft operated | aircraft | 70 |
Asset-Backed Securities | Minimum |  |
Fair Value [Line Items] |  |
Available-for-sale securities remaining maturities | 1 year |
Asset-Backed Securities | Maximum |  |
Fair Value [Line Items] |  |
Available-for-sale securities remaining maturities | 9 years |
Corporate Debt | Maximum |  |
Fair Value [Line Items] |  |
Available-for-sale securities remaining maturities | 2 years |
U.S. Government and Agency Notes |  |
Fair Value [Line Items] |  |
Available-for-sale securities remaining maturities | 1 year |
Azul |  |
Fair Value [Line Items] |  |
Equity stake in Azul | 2.00% |
Carrying value of investment | $ 238 |
Azul | Preferred Stock |  |
Fair Value [Line Items] |  |
Equity stake in Azul | 8.00% |
Clear Secure, Inc. |  |
Fair Value [Line Items] |  |
Carrying value of investment | $ 31 |
Republic |  |
Fair Value [Line Items] |  |
Equity method investment, ownership percentage | 19.00% |
ManaAir |  |
Fair Value [Line Items] |  |
Equity method investment, ownership percentage | 49.90% |
Champlain |  |
Fair Value [Line Items] |  |
Equity method investment, ownership percentage | 40.00% |
Fulcrum BioEnergy Inc. |  |
Fair Value [Line Items] |  |
Other investment ownership Interest | 6.00% |
Investment carrying value | $ 51 |
Fulcrum BioEnergy Inc. | Preferred Stock |  |
Fair Value [Line Items] |  |
Other investment ownership Interest | 7.00% |
Kingsland | Standby Letters of Credit |  |
Fair Value [Line Items] |  |
Cash collateral for a standby letter of credit | $ 217 | $ 217
Avianca Holdings S.A. (“AVH”) | DIP Loan | United Airlines, Inc. |  |
Fair Value [Line Items] |  |
Interest rate | 14.50% |
Loan balance | $ 170 |

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