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FINANCIAL DERIVATIVE INSTRUMENTS - Offsetting Derivative Liabilities (Details) - Fuel derivative contracts - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Prepaid expenses and other current assets |  |
Offsetting Liabilities |  |
Gross amounts offset in the balance sheet | $ 4 | $ 15
Gross amounts offset in the Balance Sheet | (4) | (15)
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 | $ 18 | $ 35
Gross amounts offset in the Balance Sheet | (18) | (35)
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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