Revenue Recognition - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Revenue from Contract with Customer [Abstract]
Air traffic liability balance	$ 324		$ 324		$ 303
Air traffic liability recognized as passenger revenue			89.00%
Unearned travel club revenue	(50)		$ (50)		$ (56)
Passenger revenue recognized	$ 20	$ 10	$ 38	$ 18