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FINANCIAL DERIVATIVE INSTRUMENTS - Offsetting Derivative Liabilities (Details) - Fuel derivative contracts - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Prepaid expenses and other current assets |  |
Offsetting Liabilities |  |
Gross amounts offset in the balance sheet | $ 15 | $ 106
Gross amounts offset in the Balance Sheet | (15) | (106)
Net amounts of liabilities presented in the Balance Sheet | $ 0 | $ 0
Derivative Liability, Statement of Financial Position [Extensible Enumeration] | Prepaid expenses and other current assets | Prepaid expenses and other current assets
Other assets |  |
Offsetting Liabilities |  |
Gross amounts offset in the balance sheet | $ 35 | $ 0
Gross amounts offset in the Balance Sheet | (35) | 0
Net amounts of liabilities presented in the Balance Sheet | $ 0 | $ 0
Derivative Liability, Statement of Financial Position [Extensible Enumeration] | Other assets | Other assets

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