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Termination of Merger Agreement with Spirit (Details) - USD ($) | 1 Months Ended | 12 Months Ended | 29 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2024 | Dec. 31, 2024 | Dec. 31, 2024 | Mar. 05, 2024 | Dec. 31, 2023 | Jul. 28, 2022
Business Combination, Separately Recognized Transactions [Line Items] |  |  |  |  |  |
Valuation allowance |  | $ 238,000,000 | $ 238,000,000 |  | $ 153,000,000 |
Goldman Sachs Bank USA, Bank of America, N.A. and BofA Securities, Inc | Senior Secured Bridge Facility | Bridge Facility |  |  |  |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |  |  |  |
Principal amount |  |  |  |  |  | $ 3,500,000,000
Spirit |  |  |  |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |  |  |  |
Reverse break-up 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 | $ 123,000,000 | $ 105,000,000 | $ 105,000,000 |  | $ 18,000,000 |

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