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Investments - Equity Investments (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Investments, Debt and Equity Securities [Abstract] |  |  |
Equity method investments | $ 77,000,000 | $ 43,000,000 |
JetBlue Ventures equity investments | 84,000,000 | 96,000,000 |
TWA Flight Center | 13,000,000 | 14,000,000 |
Total equity investments | 174,000,000 | 153,000,000 |
Schedule of Equity Method Investments [Line Items] |  |  |
Unrealized gain from equity method investments |  |  | $ 5,000,000
Realized gain (loss) recognized in gain (loss) on investments, net | $ (7,000,000) | 2,000,000 | (2,000,000)
TWA Flight Center Hotel |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership percentage, noncontrolling interest | 10.00% |  |
Realized gain (loss) recognized in gain (loss) on investments, net | $ 0 | $ 0 | $ 0

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