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COMMITMENTS AND CONTINGENCIES - Narrative (Details) $ in Millions |  | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2024 USD ($) | Dec. 31, 2024 USD ($) aircraft | Dec. 31, 2024 USD ($) aircraft | Dec. 31, 2023 USD ($) | Apr. 30, 2023 gate | Mar. 31, 2022 gate
Payment Guarantee |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |
Principal amount of guarantee | $ | $ 49 | $ 49 | $ 49 |  |  |
Net present value of future principal and interest payments | $ | 52 | 52 | 52 | $ 65 |  |
Los Angeles World Airports |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |
New airport gates | gate |  |  |  |  | 9 |
Projected airport improvement costs | $ | 2,300 | 2,300 | 2,300 |  |  |
Payments for airport projects | $ | 88 |  |  |  |  |
William P. Hobby Airport |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |
New airport gates | gate |  |  |  |  |  | 7
Projected airport improvement costs | $ | $ 470 | $ 470 | $ 470 |  |  |
737 MAX 8 |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |
Number of aircraft deliveries | aircraft |  |  | 22 |  |  |
B-737-700 |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |
Number of aircraft retirements | aircraft |  |  | 34 |  |  |
B-737-800 |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |
Number of aircraft retirements | aircraft |  |  | 2 |  |  |
737 MAX 7 | Year 2025 |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |
Number of aircraft orders exercised | aircraft |  | 8 |  |  |  |
737 MAX 7 | Year 2026 |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |
Number of aircraft orders exercised | aircraft |  | 5 |  |  |  |

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