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REVENUE FROM CONTRACTS WITH CUSTOMERS - Disaggregation of Revenue (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2023 | Mar. 31, 2022
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | $ 2,196 | $ 1,681
Passenger [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 1,984 | 1,511
Mileage plan other revenue [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 154 | 112
Passenger Revenue [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 1,984 | 1,511
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 | 1,648 | 1,232
Passenger Revenue [Member] | Passenger ancillary revenue [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 104 | 91
Passenger Revenue [Member] | Mileage Plan passenger revenue [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 232 | 188
Passenger Revenue [Member] | Passenger [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 1,984 | 1,511
Mileage Plan Revenue [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 386 | 300
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 | 232 | 188
Mileage Plan Revenue [Member] | Mileage plan other revenue [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 154 | 112
Cargo and Other Revenue [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 58 | 58
Cargo and Other Revenue [Member] | Cargo revenue [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 29 | 29
Cargo and Other Revenue [Member] | Other revenue [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | $ 29 | $ 29

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