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Commitments and Contingencies - Additional Information (Details) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2024 USD ($) aircraft employeeGroup | Jun. 30, 2024 USD ($) employeeGroup aircraft engine | Dec. 31, 2023 USD ($)
Long-term Purchase Commitment [Line Items] |  |  |
Costs capitalized | $ | $ 88 | $ 88 | $ 78
Litigation settlement, gain | $ | $ 50 |  |
Number of union-represented employee groups | employeeGroup | 7 | 7 |
Amount of employees represented by unions |  | 88.00% |
Accrued liabilities for health care claims | $ | $ 6 | $ 6 | $ 5
Aircraft Engine |  |  |
Long-term Purchase Commitment [Line Items] |  |  |
Number of aircraft agreed to purchase | engine |  | 14 |
Air Transportation Equipment |  |  |
Long-term Purchase Commitment [Line Items] |  |  |
Number of aircraft agreed to purchase |  | 198 |
Air Transportation Equipment | A320neo |  |  |
Long-term Purchase Commitment [Line Items] |  |  |
Number of aircraft agreed to purchase |  | 49 |
Number of aircraft eligible for conversion | 18 | 18 |
Air Transportation Equipment | A321neo |  |  |
Long-term Purchase Commitment [Line Items] |  |  |
Number of aircraft agreed to purchase |  | 149 |

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