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Financial Derivative Instruments and Risk Management - Fuel Derivatives (Details) - Aircraft Fuel Derivatives - Fuel MBoe in Thousands, $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2024 USD ($) MBoe | Dec. 31, 2023 USD ($) MBoe
Derivative [Line Items] |  |
Asset fair value recorded in prepaid expenses and other current assets | $ 0 | $ 4
Longest remaining term (months) | 3 months | 3 months
Hedged volume (barrels) | MBoe | 1,000 | 2,706
Estimated amount of existing gains (losses) expected to be reclassified into earnings in the next 12 months | $ (2) | $ (3)

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