REVENUE FROM CONTRACTS WITH CUSTOMERS - Contract Liabilities Activity (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Hawaiian deferred revenue [Member]
Change in Contract with Customer, Liability [Roll Forward]
Increase in liability for mileage credits issued	$ 537	$ 0
Mileage Plan Revenue [Member]
Change in Contract with Customer, Liability [Roll Forward]
Total Deferred Revenue balance at January 1	2,603	2,497
Revenue recognized	947	900
Total Deferred Revenue balance at Sept 30	3,192	2,599
Passenger revenue [Member] | Mileage Plan Revenue [Member]
Change in Contract with Customer, Liability [Roll Forward]
Revenue recognized	(782)	(712)
Mileage plan other revenue [Member] | Mileage Plan Revenue [Member]
Change in Contract with Customer, Liability [Roll Forward]
Revenue recognized	$ (113)	$ (86)