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FINANCIAL DERIVATIVE INSTRUMENTS - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2023 | Dec. 31, 2023 | Dec. 31, 2022
Derivative Instruments and Hedging Activities Disclosure [Abstract] |  |  |
Future hedging period for jet fuel (in months) |  | 24 months |
Current unrealized net loss in OCI | $ 55 | $ 55 |
Interest rate derivatives |  |  |
Derivative [Line Items] |  |  |
Collateral deposits | 0 | $ 0 | $ 0
Terminated amount | 150 |  |
Gain on terminated derivatives | $ 23 |  |

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