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FAIR VALUE MEASUREMENTS - Narrative (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Short-term investments | $ 2,170,000,000 |  | $ 2,170,000,000 |  | $ 3,268,000,000
Short-term investments expected to mature in one year or less | 2,100,000,000 |  | 2,100,000,000 |  |
Wheels Up | Line of Credit |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Line of credit maximum capacity | 500,000,000 |  | 500,000,000 |  |
Fuel hedge contracts |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Gain (loss) on derivatives recognized | $ (140,000,000) | $ 139,000,000 | (96,000,000) | $ (339,000,000) |
Fuel hedge contracts | Mark-to-Market |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Gain on derivative |  |  | 59,000,000 |  |
Fuel hedge contracts | Settlement Gains On Contracts |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Loss on derivative |  |  | $ 155,000,000 |  |

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