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Summary of Significant Accounting Policies Other Investments (Details) - USD ($) $ in Millions | Mar. 31, 2020 | Dec. 31, 2019
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Investments, All Other Investments [Abstract] |  |
Cost Method Investments - JetBlue Tech Ventures | $ 40 | $ 41
Cost Method Investments - TWA Flight Center Hotel | $ 14 | $ 13

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