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REVENUE FROM CONTRACTS WITH CUSTOMERS - Disaggregation of Revenue (Details) - USD ($) $ in Millions |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | $ 95 | $ 3,072 | $ 2,839 | $ 8,201 | $ 7,873
Passenger [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 2,821 | 2,618 | 7,476 | 7,200
Mileage plan other revenue [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 171 | 159 | 509 | 483
Passenger Revenue [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 2,821 | 2,618 | 7,476 | 7,200
Passenger Revenue [Member] | Passenger ticket revenue, including ticket breakage and net of taxes and fees [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 2,380 | 2,226 | 6,254 | 6,081
Passenger Revenue [Member] | Passenger ancillary revenue [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 152 | 135 | 395 | 362
Passenger Revenue [Member] | Mileage Plan passenger revenue [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 289 | 257 | 827 | 757
Passenger Revenue [Member] | Passenger [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 2,821 | 2,618 | 7,476 | 7,200
Mileage Plan Revenue [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 460 | 416 | 1,336 | 1,240
Mileage Plan Revenue [Member] | Passenger ticket revenue, including ticket breakage and net of taxes and fees [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 289 | 257 | 827 | 757
Mileage Plan Revenue [Member] | Mileage plan other revenue [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 171 | 159 | 509 | 483
Cargo and Other Revenue [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 80 | 62 | 216 | 190
Cargo and Other Revenue [Member] | Cargo revenue [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 43 | 29 | 107 | 97
Cargo and Other Revenue [Member] | Other revenue [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | $ 37 | $ 33 | $ 109 | $ 93

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