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REVENUE - Loyalty Program Liability Rollforward (Details) - Mileage Plan Revenue - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Change in Contract with Customer, Liability [Roll Forward] |  |
Beginning balance | $ 2,603 | $ 2,497
Deferred revenue acquired from Hawaiian as of September 18 | 537 | 0
Increase in liability for mileage credits issued | 1,400 | 1,197
Ending balance | 3,256 | 2,603
Passenger Services [Member] |  |
Change in Contract with Customer, Liability [Roll Forward] |  |
Revenue recognized | (1,124) | (974)
Mileage Plan Services, Other |  |
Change in Contract with Customer, Liability [Roll Forward] |  |
Revenue recognized | $ (160) | $ (117)

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