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Summary of Significant Accounting Policies - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Debt securities, held-to-maturity, sold, realized gain (loss) |  | $ 0 | $ 0 | $ 0
Equity method investments |  | 34 | 38 |
Gain on equity method investments | $ 15 | 0 | 15 | 0
Cost method investments - jetblue tech ventures |  | $ 40 | 41 |
Ownership interest |  | 10.00% |  |
Cost method investments TWA flight center hotel |  | $ 14 | 13 |
Advertising expense |  | $ 45 | 66 | 72
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 |  | 7 years |  |
Computer software, intangible asset |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Useful life of software |  | 5 years |  |
Capitalized computer software, net |  | $ 121 | 102 |
Amortization expense |  | 44 | 52 | $ 46
2021 |  | 38 |  |
2022 |  | 34 |  |
2023 |  | 27 |  |
2024 |  | 16 |  |
2025 |  | 6 |  |
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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