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FAIR VALUE MEASUREMENTS - Narrative (Details) - Fuel hedge contracts - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
(Losses) gains on derivatives recognized | $ (21) | $ 89 | $ 12 | $ 9
Mark-to-Market |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Gain on derivative |  |  | 21 |
Settlement Losses on Contracts |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Loss on derivative |  |  | $ 9 |

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