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REVENUE - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024 | Dec. 31, 2024
Disaggregation of Revenue [Line Items] |  |  |  |  |
Receivables - net | $ 737 |  | $ 737 |  | $ 558
Passenger revenue |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue recognized | 228 | $ 150 | 1,100 | $ 717 |
Mileage Plan Revenue |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Receivables - net | $ 306 |  | $ 306 |  | $ 176

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