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FINANCIAL DERIVATIVE INSTRUMENTS - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2023 | Dec. 31, 2024 | Dec. 31, 2024
Derivative Instruments and Hedging Activities Disclosure [Abstract] |  |  |
Future hedging period for jet fuel (in months) |  |  | 24 months
Current unrealized net loss in OCI |  | $ 96 | $ 96
Derivative [Line Items] |  |  |
Change in fair value, loss recognized |  | $ 37 |
Interest Rate Swap |  |  |
Derivative [Line Items] |  |  |
Terminated amount | $ 150 |  |
Gain on terminated derivatives | $ 23 |  |

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