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Financial Derivative Instruments and Risk Management - Fuel Derivatives (Details) - Aircraft Fuel Derivatives - Fuel
$ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2023
USD ($)
MBoe
Dec. 31, 2022
USD ($)
MBoe
Derivative [Line Items]    
Asset fair value recorded in prepaid expense and other current assets $ 3 $ 3
Longest remaining term (months) 3 months 3 months
Hedged volume (barrels) | MBoe 3,240,000 450
Estimated amount of existing losses expected to be reclassified into earnings in the next 12 months $ 6 $ 2