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Summary of Significant Accounting Policies - Narrative (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Nov. 30, 2022 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2022 | Mar. 31, 2021
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Letter of credit, commitment fee amount | $ 65 |  |  |  |  |
Change in fair value |  | $ (4) | $ 0 | $ (11) |  |
Equity method investments |  | 38 | 32 |  |  |
Net unrealized loss |  | 2 | 2 | 4 |  |
Unrealized loss on investments |  | 12 | 10 |  |  |
Realized gain on equity investment securities |  | 1 |  |  |  |
Cost method investments - jetblue tech ventures |  | 83 | 72 |  |  |
Recognized (loss) gain on investment |  | $ (2) | 37 | 2 |  |
Ownership interest |  | 10.00% |  |  |  |
Cost method investments TWA flight center hotel |  | $ 14 | 14 |  |  |
Travel credit extension period |  | 24 months |  |  |  |
Advertising expense |  | $ 59 | 45 | 45 |  |
Available-for-sale securities |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Change in fair value |  | $ (1) | 0 | 0 |  |
JMP Holdings, LLC |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Letter of credit, commitment fee percentage | 5.00% |  |  |  |  |
Senior Notes | Convertible Senior Notes Due 2026 |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  | $ 750 | $ 750
Debt instrument, interest rate, stated percentage |  | 0.50% |  |  | 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 |  | $ 123 | 144 |  |  |
Amortization expense |  | 51 | 45 | $ 44 |  |
2023 |  | 48 |  |  |  |
2024 |  | 37 |  |  |  |
2025 |  | 23 |  |  |  |
2026 |  | 12 |  |  |  |
2027 |  | 3 |  |  |  |
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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