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REVENUE - Narrative (Details) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2023 USD ($) performanceObligation | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Jul. 28, 2022 USD ($) | Dec. 31, 2019
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |
Modification of contract |  |  |  | $ 1,900 |
Residual travel funds (as a percent) | 8.00% | 9.00% |  |  | 2.00%
Loyalty points, redemption period (in years) | 1 year |  |  |  |
Total operating revenues | $ 26,091 | $ 23,814 | $ 15,790 |  |
Revenue From Contract With Customer, Number Of Performance Obligations | performanceObligation | 2 |  |  |  |
Other Revenue |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |
Total operating revenues | $ 2,100 | $ 2,100 | $ 1,400 |  |

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