REVENUE - Loyalty Program Liability Rollforward (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024
Loyalty Plan Revenue
Change in Contract with Customer, Liability [Roll Forward]
Beginning balance	$ 3,256	$ 2,603
Increase in liability for loyalty points issued	1,364	947
Ending balance	3,433	3,192
Loyalty Plan Revenue | Passenger Services
Change in Contract with Customer, Liability [Roll Forward]
Revenue recognized	(993)	(782)
Loyalty Plan Revenue | Loyalty program other
Change in Contract with Customer, Liability [Roll Forward]
Revenue recognized	(194)	(113)
Hawaiian Deferred Revenue
Change in Contract with Customer, Liability [Roll Forward]
Increase in liability for loyalty points issued	$ 0	$ 537