DEBT - Narrative (Details) - USD ($)	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Debt Instrument [Line Items]
Weighted-average interest rate (in percent)	4.70%
Long-term debt payments	$ (156,000,000)	$ (102,000,000)
Proceeds from Issuance of Long-Term Debt, Noncash proceeds [Member]
Debt Instrument [Line Items]
Proceeds from long-term debt	23,000,000
Alaskan And Hawaiian Credit Facility | Revolving Credit Facility | Line of Credit
Debt Instrument [Line Items]
Line of credit facility, borrowing capacity	850,000,000
Outstanding borrowing	0
Alaskan Credit Facility | Revolving Credit Facility | Line of Credit
Debt Instrument [Line Items]
Line of credit facility, borrowing capacity	76,000,000
Interest rate swap agreements | Cash Flow Hedging | Derivative Instruments Designated as Hedges
Debt Instrument [Line Items]
Notional amount	$ 554,000,000