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Summary of Significant Accounting Policies - Other Investments (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Aug. 31, 2021 | Sep. 30, 2021 | Sep. 30, 2021 | Dec. 31, 2020
Accounting Policies [Abstract] |  |  |  |
Cost method investments - jetblue tech ventures |  | $ 67 | $ 67 | $ 40
Recognized gain on investment | $ 17 | 37 | 37 |
Carrying value of investment |  | $ 36 | $ 36 |
Measurement alternative, ownership percentage |  | 10.00% | 10.00% |
Cost method investments - TWA flight center hotel |  | $ 14 | $ 14 | $ 14

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