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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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