Financial Derivative Instruments and Risk Management - Additional Information (Details)	12 Months Ended
	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($) aircraft engine	Dec. 31, 2021 USD ($)
Derivative [Line Items]
Future aircraft deliveries with option to enter into and exercise cash settled swaps | engine		4
Other Noncurrent Assets
Derivative [Line Items]
Derivative Instruments in hedges, assets, at fair value	$ 0	$ 24,000,000
Fuel Derivative Contracts
Derivative [Line Items]
Cost of swap			$ 0
Interest Rate Swap
Derivative [Line Items]
Cost of swap	0	$ 19,000,000
Future aircraft deliveries with option to enter into and exercise cash settled swaps | aircraft		14
Unrealized losses from cash flow hedges net of adjustment for dedesignation of fuel hedges, net of deferred tax benefit	7,000,000
Fuel
Derivative [Line Items]
Cost of swap	$ 0