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DERIVATIVE INSTRUMENTS - BALANCE SHEET CLASSIFICATION (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | --- | ---
Derivatives, Fair Value [Line Items] |  |  |  |
Accumulated other comprehensive loss | $ (299) | $ (388) | $ (262) | $ (494)
Fuel hedge contracts [Member] | Derivative Instruments Not Designated as Hedges [Member] | Fuel Hedge Contracts, Current [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Assets, Current | 10 | 33 |  |
Fuel hedge contracts [Member] | Derivative Instruments Not Designated as Hedges [Member] | Fuel Hedge Contracts, Noncurrent [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Assets, Current | 1 | 11 |  |
Interest rate swaps agreements [Member] | Derivative Instruments Designated as Hedges [Member] | Prepaid Expenses and Other Current Assets [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Assets, Current | 6 | 8 |  |
Interest rate swaps agreements [Member] | Derivative Instruments Designated as Hedges [Member] | Other Noncurrent Assets [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Assets, Current | 2 | 7 |  |
Interest rate swaps agreements [Member] | Derivative Instruments Designated as Hedges [Member] | Accumulated Other Comprehensive Loss [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Accumulated other comprehensive loss | $ (7) | $ 23 |  |

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