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REVENUE FROM CONTRACTS WITH CUSTOMERS - Disaggregation of Revenue (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | $ 2,897 | $ 2,838 | $ 5,129 | $ 5,034
Passenger [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 2,651 | 2,598 | 4,655 | 4,582
Mileage plan other revenue [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 174 | 170 | 338 | 324
Passenger Revenue [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 2,651 | 2,598 | 4,655 | 4,582
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 | 2,226 | 2,207 | 3,874 | 3,855
Passenger Revenue [Member] | Passenger ancillary revenue [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 135 | 123 | 243 | 227
Passenger Revenue [Member] | Mileage Plan passenger revenue [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 290 | 268 | 538 | 500
Passenger Revenue [Member] | Passenger [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 2,651 | 2,598 | 4,655 | 4,582
Mileage Plan Revenue [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 464 | 438 | 876 | 824
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 | 290 | 268 | 538 | 500
Mileage Plan Revenue [Member] | Mileage plan other revenue [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 174 | 170 | 338 | 324
Cargo and Other Revenue [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 72 | 70 | 136 | 128
Cargo and Other Revenue [Member] | Cargo revenue [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 36 | 39 | 64 | 68
Cargo and Other Revenue [Member] | Other revenue [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | $ 36 | $ 31 | $ 72 | $ 60

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