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Termination of Merger Agreement with Spirit (Details) - USD ($) | 9 Months Ended | 26 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2024 | Mar. 31, 2024 | Mar. 05, 2024 | Jul. 28, 2022
Goldman Sachs Bank USA, Bank of America, N.A. and BofA Securities, Inc | Bridge Facility | Senior Secured Bridge Facility |  |  |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |  |  |
Debt instrument, face amount |  |  |  |  | $ 3,500,000,000
Spirit |  |  |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |  |  |
Termination fee |  |  |  | $ 69,000,000 |
Payment of ticking fee, per share (in dollars per share) |  |  |  |  | $ 0.10
Payment for Spirit Airlines acquisition | $ 22,000,000 | $ 425,000,000 |  |  |
Frontier transaction costs |  | $ 25,000,000 |  |  |
Valuation allowance |  |  | $ 134,000,000 |  |

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