REVENUE - Loyalty Program Liability Rollforward (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 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	1,779	1,400
Ending balance	3,433	3,256
Loyalty Plan Revenue | Passenger Services
Change in Contract with Customer, Liability [Roll Forward]
Revenue recognized	(1,347)	(1,124)
Loyalty Plan Revenue | Loyalty program other
Change in Contract with Customer, Liability [Roll Forward]
Revenue recognized	(255)	(160)
Hawaiian Deferred Revenue
Change in Contract with Customer, Liability [Roll Forward]
Increase in liability for loyalty points issued	$ 0	$ 537