DEBT - CSC Holdings Credit Facilities (Details) - USD ($)	3 Months Ended			6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Debt Instrument [Line Items]
Principal amount	$ 26,456,208,000			$ 26,456,208,000		$ 26,671,018,000
Gain (Loss) on Extinguishment of Debt	0	$ 51,712,000		0	$ 51,712,000
Proceeds from long-term debt				460,000,000	3,160,000,000
Repayments of line of credit				758,861,000	3,057,469,000
Loss on extinguishment of debt and write-off of deferred financing costs	0	(51,712,000)		0	(51,712,000)
CSC Holdings
Debt Instrument [Line Items]
Gain (Loss) on Extinguishment of Debt	0	51,712,000		0	51,712,000
Cash distributions to parent	0	184,478,000	$ 501,000,000	0	685,478,000
Proceeds from long-term debt				460,000,000	3,160,000,000
Repayments of line of credit				758,861,000	3,057,469,000
Loss on extinguishment of debt and write-off of deferred financing costs	0	$ (51,712,000)		0	$ (51,712,000)
5.5% Notes due April 15, 2027 | Secured Debt [Member]
Debt Instrument [Line Items]
Principal amount	$ 1,310,000,000			$ 1,310,000,000		1,310,000,000
Stated interest rate	5.50%			5.50%
8.0% Notes due April 15, 2020 | Senior Notes
Debt Instrument [Line Items]
Principal amount	$ 1,000,000,000			$ 1,000,000,000		1,000,000,000
Stated interest rate	3.375%			3.375%
Secured Debt [Member] | CSC Holdings Revolving Credit Facility | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate				2.25%
Secured Debt [Member] | Incremental Term Loan B-3
Debt Instrument [Line Items]
Principal amount	$ 1,233,563,000			$ 1,233,563,000		1,239,938,000
Secured Debt [Member] | Incremental Term Loan B-5
Debt Instrument [Line Items]
Principal amount	2,932,500,000			2,932,500,000		2,947,500,000
Secured Debt [Member] | Cablevision Lightpath Term B Loan
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	100,000,000			100,000,000
Principal amount	591,000,000			$ 591,000,000		594,000,000
Secured Debt [Member] | Cablevision Lightpath Term B Loan | Alternate Base Rate
Debt Instrument [Line Items]
Basis spread on variable rate				2.25%
Secured Debt [Member] | Cablevision Lightpath Term B Loan | Eurodollar
Debt Instrument [Line Items]
Basis spread on variable rate				3.25%
Secured Debt [Member] | Amended and Extended CSC Holdings Revolving Credit Facility | Alternate Base Rate
Debt Instrument [Line Items]
Basis spread on variable rate				2.25%
Secured Debt [Member] | Amended and Extended CSC Holdings Revolving Credit Facility | Alternate base Rate
Debt Instrument [Line Items]
Basis spread on variable rate				1.25%
Secured Debt [Member] | Amended and Extended CSC Holdings Revolving Credit Facility | Credit Adjustment Spread
Debt Instrument [Line Items]
Basis spread on variable rate				0.10%
Revolving Credit Facility | CSC Holdings Revolving Credit Facility
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	2,475,000,000			$ 2,475,000,000
Principal amount	675,000,000			675,000,000		$ 900,000,000
Revolving Credit Facility | Amended and Extended CSC Holdings Revolving Credit Facility
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	2,325,000,000			2,325,000,000
Revolving Credit Facility | Non-Extended CSC Holdings Revolving Credit Facility
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 150,000,000			$ 150,000,000