SUPPLEMENTAL CASH FLOW INFORMATION (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Non-Cash Investing and Financing Activities:
Property and equipment accrued but unpaid	$ 335,680	$ 206,680	$ 188,067
Notes payable issued to vendor for the purchase of equipment and other assets	89,898	106,925	35,124
Right-of-use assets acquired in exchange for finance lease obligations	145,047	133,300	54,532
Other non-cash investing and financing transactions	500	3,973	1,563
Assumption of Cablevision debt, net of the acquisition of Cablevision assets	0	0	169,334
Contributions from (distributions to) parent, net	(19,500)	178,720	151,455
Supplemental Data:
Cash interest paid		1,406,825	1,436,332
Income taxes paid, net		80,415	10,263
CSC Holdings
Non-Cash Investing and Financing Activities:
Contributions from (distributions to) parent, net		178,720	151,455
Supplemental Data:
Cash interest paid	1,178,088	1,406,825	1,350,756
Income taxes paid, net	$ 263,589	80,415	10,263
CSC Holdings | Additional Paid-in Capital [Member]
Non-Cash Investing and Financing Activities:
Contributions from (distributions to) parent, net		$ 178,720	$ 151,455