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Commitments and Contingencies - Narrative (Details) $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jan. 31, 2023 | Jun. 30, 2025 USD ($) airframe engine | Jun. 30, 2025 USD ($) | Dec. 31, 2024 USD ($) | Feb. 28, 2023 lawsuit | Dec. 31, 2022 lawsuit | Jul. 14, 2022 pilot_instructor
Unrecorded Unconditional Purchase Obligation [Line Items] |  |  |  |  |  |  |
Assets held for sale |  | $ 57 | $ 57 | $ 33 |  |  |
Restricted cash and cash equivalents |  | 235 | 235 |  |  |  |
Restricted assets pledged under letter of credit |  | 71 | 71 |  |  |  |
Letters of credit |  | 57 | 57 |  |  |  |
Restricted assets pledged related to workers compensation insurance policies and other business partner agreements |  | $ 42 | $ 42 |  |  |  |
Percentage of employees represented by unions under collective bargaining agreements |  | 50.00% | 50.00% |  |  |  |
Percentage of employees represented by unions under collective bargaining agreements, will become amendable within one year |  | 22.00% | 22.00% |  |  |  |
Collective bargaining agreement contract extension period | 2 years |  |  |  |  |  |
Number of flight instructor | pilot_instructor |  |  |  |  |  |  | 35
Employment agreement term |  |  | 5 years |  |  |  |
Automatic renewal term, employment agreement, term |  |  | 5 years |  |  |  |
Renewal notice period, employment agreement, period |  |  | 90 days |  |  |  |
Loss contingency, pending claims, number | lawsuit |  |  |  |  | 4 | 4 |
Embraer E190 fleet |  |  |  |  |  |  |
Unrecorded Unconditional Purchase Obligation [Line Items] |  |  |  |  |  |  |
Number of airframes sold | airframe |  | 25 |  |  |  |  |
Number of engines sold | engine |  | 59 |  |  |  |  |
Disposal consideration |  | $ 9 | $ 9 |  |  |  |
JFK Millennium Partner LLC |  |  |  |  |  |  |
Unrecorded Unconditional Purchase Obligation [Line Items] |  |  |  |  |  |  |
Letters of credit |  | $ 65 | $ 65 |  |  |  |
Ownership percentage |  | 5.00% | 5.00% |  |  |  |

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