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FAIR VALUE MEASUREMENTS- Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Short-term investments | $ 1,127 | $ 3,268 |
Fuel hedge contracts |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
(Loss) gain recognized on derivatives | 6 | $ 394 | $ 146
Fuel hedge contracts | Settlement Gains On Contracts |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Loss on derivative | 58 |  |
Fuel hedge contracts | Mark-to-Market |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |
Gain on derivative | $ 52 |  |

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