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FINANCIAL DERIVATIVE INSTRUMENTS - Premium Expense (Benefit) for Fuel Derivative Contracts (Details) - Fuel derivative contracts - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Designated as Hedging Instrument | Fuel and oil |  |  |
Derivative [Line Items] |  |  |
Premium expense (benefit) recognized in income on derivatives | $ 148 | $ 121 | $ 105
Not Designated as Hedging Instrument, Economic Hedge | Other (gains) losses, net |  |  |
Derivative [Line Items] |  |  |
Premium expense (benefit) recognized in income on derivatives | $ 9 | $ 0 | $ (28)

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