INCOME TAXES - Pre tax income loss (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Effective Income Tax Rate Reconciliation [Line Items]
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	$ (1,929,955)	$ (82,348)	$ 118,565
CSC Holdings
Effective Income Tax Rate Reconciliation [Line Items]
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	(1,945,554)	(85,692)	118,565
U.S
Effective Income Tax Rate Reconciliation [Line Items]
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	(1,871,460)	(43,023)	148,464
U.S | CSC Holdings
Effective Income Tax Rate Reconciliation [Line Items]
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	(1,887,059)	(46,367)	148,464
International
Effective Income Tax Rate Reconciliation [Line Items]
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	(58,495)	(39,325)	(29,899)
International | CSC Holdings
Effective Income Tax Rate Reconciliation [Line Items]
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	$ (58,495)	$ (39,325)	$ (29,899)