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FAIR VALUE MEASUREMENTS - Narrative (Details) - Fuel hedge contracts - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Gain (loss) on derivatives recognized | $ 53 | $ 16 | $ 33 | $ (80)
Mark-to-Market |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Gain on derivative |  |  | 32 |
Settlement Losses on Contracts |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Gain on derivative |  |  | $ 1 |

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