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Financial Derivative Instruments and Risk Management - Fuel Derivatives (Details) - Aircraft Fuel Derivatives - Fuel $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($) MBoe	Dec. 31, 2024 USD ($) MBoe
Derivative [Line Items]
Asset fair value recorded in prepaid expenses and other current assets	$ 4	$ 0
Longest remaining term (months)	3 months
Hedged volume (barrels, in thousands) | MBoe	2,706	0
Estimated amount of existing gains (losses) expected to be reclassified into earnings in the next 12 months	$ (3)	$ 0

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