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Financial Derivative Instruments and Risk Management - Fuel Derivatives (Details) - Aircraft Fuel Derivatives - Fuel
$ in Millions
12 Months Ended
Dec. 31, 2022
USD ($)
MBoe
Dec. 31, 2021
USD ($)
MBoe
Derivative [Line Items]    
Asset fair value recorded in prepaid expenses and other current assets $ 3 $ 0
Longest remaining term (months) 3 months  
Hedged volume (barrels, in thousands) | MBoe 450 0
Estimated amount of existing gains expected to be reclassified into earnings in the next 12 months $ 2 $ 0