DEBT - Narrative (Details) - USD ($)	3 Months Ended
	Mar. 31, 2026	May 07, 2026
Debt Instrument [Line Items]
Weighted-average interest rate (in percent)	4.90%
Debt payments	$ 227,000,000
Prepayments of debt	113,000,000
Other Debt Obligations
Debt Instrument [Line Items]
Debt instrument, face amount	111,000,000
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 And Hawaiian Credit Facility | Revolving Credit Facility | Line of Credit | Subsequent Event
Debt Instrument [Line Items]
Line of credit facility, borrowing capacity		$ 1,100,000,000
Alaskan Credit Facility | Revolving Credit Facility | Line of Credit
Debt Instrument [Line Items]
Line of credit facility, borrowing capacity	106,000,000
Interest rate swap agreements | Cash Flow Hedging | Derivative Instruments Designated as Hedges
Debt Instrument [Line Items]
Notional amount	$ 633,000,000