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REVENUE RECOGNITION - Roll Forward of Frequent Flyer Deferred Revenue (Details) - Frequent Flyer - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Movement in Deferred Revenue [Roll Forward] |  |
Balance at January 1 | $ 7,143 | $ 6,675
Miles earned | 3,563 | 3,297
Travel miles redeemed | (3,150) | (2,723)
Non-travel miles redeemed | (115) | (106)
Balance at December 31 | $ 7,441 | $ 7,143

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- Details
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