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Summary of Significant Accounting Policies - Narrative (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Aug. 31, 2021 | Sep. 30, 2019 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Mar. 31, 2021
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Debt securities, held-to-maturity, sold, realized gain (loss) |  |  | $ 0 | $ 0 | $ 0 |
Equity method investments |  |  | 32 | 34 |  |
Gain on equity investments, net |  | $ 15 | 44 | 0 | 15 |
Cost method investments - jetblue tech ventures |  |  | 72 | 40 |  |
Recognized gain on investment | $ 17 |  | 37 |  |  |
Net gain recognized on investment |  |  | 7 |  |  |
Carrying value of investment |  |  | $ 26 |  |  |
Ownership interest |  |  | 10.00% |  |  |
Cost method investments TWA flight center hotel |  |  | $ 14 | 14 |  |
Advertising expense |  |  | $ 45 | 45 | 66 |
Senior Notes | Convertible Senior Notes Due 2026 |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  | $ 750
Debt instrument, interest rate, stated percentage |  |  | 0.50% |  |  | 0.50%
Minimum |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Term of contract under loyalty program |  |  | 1 year |  |  |
Maximum |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Term of contract under loyalty program |  |  | 10 years |  |  |
Computer software, intangible asset |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Useful life of software |  |  | 5 years |  |  |
Capitalized computer software, net |  |  | $ 144 | 121 |  |
Amortization expense |  |  | 45 | 44 | $ 52 |
2022 |  |  | 46 |  |  |
2023 |  |  | 39 |  |  |
2024 |  |  | 28 |  |  |
2025 |  |  | 14 |  |  |
2026 |  |  | 4 |  |  |
High density airports, take-off and landing slots |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Intangible assets, net (excluding goodwill) |  |  | $ 139 | $ 139 |  |

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