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FINANCIAL DERIVATIVE INSTRUMENTS - Premiums for Fuel Derivative Contracts (Details) - Fuel derivative contracts - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Designated as Hedging Instrument | Fuel and oil |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Premium (benefit) expense recognized in income on derivatives |  |  | $ 121 | $ 105 | $ 57
Not Designated as Hedging Instrument, Economic Hedge | Other (gains)/losses, net |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Premium (benefit) expense recognized in income on derivatives | $ 0 | $ (28) |  |  | $ 43

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