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FAIR VALUE MEASUREMENTS - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022 | Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Short-term investments | $ 3,368 |  | $ 3,368 |  | $ 3,268
Short-term investments expected to mature in one year or less | 3,100 |  | 3,100 |  |
Fuel hedge contracts |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Gain (loss) on derivatives recognized | $ 12 | $ (239) | 43 | $ (478) |
Fuel hedge contracts | Mark-to-Market |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Gain on derivative |  |  | 39 |  |
Fuel hedge contracts | Settlement Gains On Contracts |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Gain on derivative |  |  | $ 4 |  |

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