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DEBT - CSC Holdings Credit Facilities (Details) - USD ($)	3 Months Ended				6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Debt Instrument [Line Items]
Principal amount	$ 27,158,633,000				$ 27,158,633,000		$ 26,940,911,000
Loss on extinguishment of debt and write-off of deferred financing costs	51,712,000		$ 0		51,712,000	$ 0
Proceeds from long-term debt					3,160,000,000	1,925,000,000
Repayments of line of credit					3,057,469,000	277,114,000
Loss on extinguishment of debt and write-off of deferred financing costs	(51,712,000)		0		(51,712,000)	0
CSC Holdings
Debt Instrument [Line Items]
Loss on extinguishment of debt and write-off of deferred financing costs	51,712,000		0		51,712,000	0
Cash distributions to parent	184,478,000	$ 501,000,000	652,383,000	$ 720,350,000	685,478,000	1,372,733,000
Proceeds from long-term debt					3,160,000,000	1,925,000,000
Repayments of line of credit					3,057,469,000	277,114,000
Loss on extinguishment of debt and write-off of deferred financing costs	(51,712,000)		$ 0		(51,712,000)	$ 0
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	$ 1,246,313,000				$ 1,246,313,000		1,252,688,000
Secured Debt [Member] | Incremental Term Loan B-5
Debt Instrument [Line Items]
Principal amount	2,962,500,000				$ 2,962,500,000		2,977,500,000
Secured Debt [Member] | CSC Holdings Revolving Credit Facility - Non-Extend Creditors [Member] | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate					3.25%
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	$ 325,000,000				$ 325,000,000		$ 625,000,000

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