ACQUISITION OF HAWAIIAN HOLDINGS, INC. - Narrative (Details) - Hawaiian Holdings, Inc. - USD ($) $ / shares in Units, shares in Millions, $ in Millions		3 Months Ended		6 Months Ended
	Sep. 18, 2024	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Business Combination [Line Items]
Multiplied by cash consideration for each share of common stock per the merger agreement (in dollars per share)	$ 18.00
Cash consideration paid for common stock issued and outstanding	$ 936
Number of shares of Hawaiian common stock issued and outstanding (in shares)	52
Cash consideration paid for settlement of equity awards and change in control payments	$ 41
Total purchase price	$ 977
Merger-related costs		$ 53	$ 30	$ 93	$ 38