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ACQUISITION OF HAWAIIAN HOLDINGS, INC. - Narrative (Details) - Hawaiian Holdings, Inc. - USD ($) $ / shares in Units, shares in Millions, $ in Millions |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Sep. 18, 2024 | Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Business Combination [Line Items] |  |  |  |  |
Multiplied by cash consideration for each share of common stock per the merger agreement (in dollars per share) | $ 18.00 |  |  |  |
Cash consideration paid for common stock issued and outstanding | $ 936 |  |  |  |
Number of shares of Hawaiian common stock issued and outstanding (in shares) | 52 |  |  |  |
Cash consideration paid for settlement of equity awards and change in control payments | $ 41 |  |  |  |
Total purchase price | $ 977 |  |  |  |
Merger-related costs |  | $ 53 | $ 30 | $ 93 | $ 38

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