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ACQUISITION OF HAWAIIAN HOLDINGS, INC. - Intangible Assets (Details) - Hawaiian Holdings, Inc. - USD ($) $ in Millions | Sep. 18, 2024 | Dec. 31, 2024 | Sep. 30, 2024
--- | --- | --- | ---
Business Acquisition [Line Items] |  |  |
Total finite-lived intangible assets | $ 407 |  |
Total intangible assets | 799 | $ 799 | $ 799
Hawaiian Trademark |  |  |
Business Acquisition [Line Items] |  |  |
Indefinite-lived intangible assets | 390 |  |
Slots |  |  |
Business Acquisition [Line Items] |  |  |
Indefinite-lived intangible assets | 2 |  |
Customer Relationships |  |  |
Business Acquisition [Line Items] |  |  |
Total finite-lived intangible assets | $ 285 |  |
Weighted Average Amortization Period (in years) | 18 years |  |
Co-brand Partnerships |  |  |
Business Acquisition [Line Items] |  |  |
Total finite-lived intangible assets | $ 122 |  |
Weighted Average Amortization Period (in years) | 3 years |  |

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