ACQUISITION OF HAWAIIAN HOLDINGS, INC. - Intangible Assets (Details) - Hawaiian Holdings, Inc. - USD ($) $ in Millions	Sep. 18, 2024	Dec. 31, 2024	Sep. 30, 2024
Business Acquisition [Line Items]
Total finite-lived intangible assets	$ 407
Total intangible assets	799	$ 799	$ 799
Hawaiian Trademark
Business Acquisition [Line Items]
Indefinite-lived intangible assets	390
Slots
Business Acquisition [Line Items]
Indefinite-lived intangible assets	2
Customer Relationships
Business Acquisition [Line Items]
Total finite-lived intangible assets	$ 285
Weighted Average Amortization Period (in years)	18 years
Co-brand Partnerships
Business Acquisition [Line Items]
Total finite-lived intangible assets	$ 122
Weighted Average Amortization Period (in years)	3 years