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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 ($) MBoe | Dec. 31, 2022 USD ($) MBoe
Derivative [Line Items] |  |
Asset fair value recorded in prepaid expenses and other current assets | $ 4 | $ 3
Longest remaining term (months) | 3 months | 3 months
Hedged volume (barrels, in thousands) | MBoe | 2,706 | 450
Estimated amount of existing gains (losses) expected to be reclassified into earnings in the next 12 months | $ (3) | $ 2

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