DEBT - Narrative (Details)	12 Months Ended
	Dec. 31, 2024 USD ($)
Debt Instrument [Line Items]
Weighted-average interest rate (in percent)	4.70%
Debt instrument, increase (decrease)	$ 68,000,000
Prepayment	1,600,000,000
Repayments of debt	314,000,000
Line of credit facility, asset restrictions, unrestricted cash and marketable securities	500,000,000
Line of Credit | Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility, asset restrictions, unrestricted cash and marketable securities	500,000,000
Senior Secured Notes Due 2029 | Senior Notes
Debt Instrument [Line Items]
Proceeds from long-term debt	$ 625,000,000
Interest rate (in percent)	5.021%
Senior Secured Notes due 2031 | Senior Notes
Debt Instrument [Line Items]
Proceeds from long-term debt	$ 625,000,000
Interest rate (in percent)	5.308%
Variable Rate Term Loan Facility | Secured Debt
Debt Instrument [Line Items]
Proceeds from long-term debt	$ 750,000,000
Other Debt
Debt Instrument [Line Items]
Debt instrument, face amount	415,000,000
Other Debt | Secured Debt
Debt Instrument [Line Items]
Debt instrument, face amount	347,000,000
Alaskan And Hawaiian Credit Facility | Line of Credit | Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility, borrowing capacity	850,000,000
Outstanding borrowing	0
Alaskan Credit Facility | Line of Credit | Revolving Credit Facility
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	$ 567,000,000