GOODWILL AND INTANGIBLE ASSETS - Narrative (Details) - USD ($) $ in Millions		12 Months Ended
	Sep. 18, 2024	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill		$ 2,723	$ 2,724
Finite-Lived Intangible Assets [Line Items]
Amortization expense of intangible assets		58	$ 16	$ 5
Projected amortization expense, year one		56
Projected amortization expense, year two		45
Projected amortization expense, year three		16
Projected amortization expense, year four		16
Projected amortization expense, year five		16
Hawaiian Holdings, Inc.
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill		$ 780
Hawaiian Holdings, Inc. | Customer Relationships
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period (in years)	18 years
Hawaiian Holdings, Inc. | Co-brand Partnerships
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period (in years)	3 years