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REVENUE RECOGNITION - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Revenue from Contract with Customer [Abstract] |  |  |
Revenue recognized that was previously recorded in air traffic liability | $ 7,400 | $ 4,200 | $ 2,200
Disaggregation of Revenue [Line Items] |  |  |
Marketing contracts initial terms, minimum (in years) | 1 year |  |
Marketing contracts initial terms, maximum (in years) | 13 years |  |
Cash sales of miles from marketing agreements | $ 6,900 | 5,700 | $ 4,100
Majority of new miles, redemption period (in years) | 2 years |  |
Air traffic |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Deferred revenue (current and noncurrent) |  | 8,300 |
Loyalty program deferred revenue |  | $ 100 |

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