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Entry into Merger Agreement with Spirit (Details) - USD ($) |  | 12 Months Ended | 17 Months Ended |
--- | --- | --- | --- | ---
Jul. 28, 2022 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2023 | May 16, 2022
Business Combination, Separately Recognized Transactions [Line Items] |  |  |  |  |  |
Common stock, par value (in dollars per share) |  | $ 0.01 | $ 0.01 |  | $ 0.01 |
Payment for Spirit Airlines acquisition |  | $ 131,000,000 | $ 297,000,000 | $ 0 |  |
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] |  |  |  |  |  |
Common stock, par value (in dollars per share) | $ 0.0001 |  |  |  |  | $ 0.0001
Acquisition price (in dollars per share) | 33.50 |  |  |  |  | $ 30.00
Business acquisition amount equal to extent paid (in dollars per share) | 2.50 |  |  |  |  |
Payment of ticking fee, per share (in dollars per share) | $ 0.10 |  |  |  |  |
Additional prepayment period | 5 days |  |  |  |  |
Payment for Spirit Airlines acquisition |  | $ 131,000,000 |  |  | $ 403,000,000 |
Frontier transaction costs |  |  |  |  | $ 25,000,000 |
Spirit | Minimum |  |  |  |  |  |
Business Combination, Separately Recognized Transactions [Line Items] |  |  |  |  |  |
Business acquisition amount equal to extent paid (in dollars per share) | $ 1.15 |  |  |  |  |

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