DEBT - Senior Guaranteed Notes, Senior Secured Notes, and Senior Notes and Debentures (Details) - USD ($)	3 Months Ended	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2020	Apr. 25, 2023
Debt Instrument [Line Items]
Principal amount	$ 25,096,412,000	$ 25,096,412,000	$ 25,126,605,000
Repayments of Debt		(4,223,233,000)	(2,688,009,000)	$ (4,469,727,000)
Loss (gain) on extinguishment of debt and write-off of deferred financing costs		12,901,000	(4,393,000)	575,000
Supply chain financing arrangement credit limit	175,000,000	$ 175,000,000
Secured Debt [Member] | Synthetic LIBOR Rate (one month)
Debt Instrument [Line Items]
Basis spread on variable rate		0.11448%
Secured Debt [Member] | Synthetic LIBOR Rate (three months)
Debt Instrument [Line Items]
Basis spread on variable rate		0.26161%
Secured Debt [Member] | Synthetic LIBOR Rate (six months)
Debt Instrument [Line Items]
Basis spread on variable rate		0.42826%
CSC Holdings Revolving Credit Facility | Revolving Credit Facility
Debt Instrument [Line Items]
Principal amount	1,700,000,000	$ 1,700,000,000	825,000,000
Line of Credit Facility, Maximum Borrowing Capacity	2,475,000,000	2,475,000,000
Line of credit facility, remaining borrowing capacity	611,262,000	611,262,000
Credit facility	1,697,559,000	$ 1,697,559,000	821,632,000
CSC Holdings Revolving Credit Facility | Secured Debt [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Debt Instrument [Line Items]
Basis spread on variable rate		2.25%
Cablevision Lightpath Revolving Credit Facility | Revolving Credit Facility
Debt Instrument [Line Items]
Principal amount	0	$ 0	0
Line of Credit Facility, Maximum Borrowing Capacity	115,000	115,000			$ 100,000,000
Credit facility	0	0	0
Incremental Term Loan B-3 | Secured Debt [Member]
Debt Instrument [Line Items]
Principal amount	0	0	521,744,000
Credit facility	$ 0	$ 0	520,988,000
Cablevision Lightpath Term B Loan
Debt Instrument [Line Items]
Senior Debt Covenant, Leverage Ratio	6.75	6.75
Incurrence Test	4.75	4.75
Cablevision Lightpath Term B Loan | Secured Debt [Member]
Debt Instrument [Line Items]
Principal amount	$ 676,000,000	$ 676,000,000	582,000,000		$ 600,000,000
Loss (gain) on extinguishment of debt and write-off of deferred financing costs		5,866,000
Line of credit facility, periodic payment amount	1,760,000
Credit facility	673,107,000	$ 673,107,000	571,898,000
Debt discount rate					99.50%
Cablevision Lightpath Term B Loan | Secured Debt [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Debt Instrument [Line Items]
Basis spread on variable rate		3.25%
Cablevision Lightpath Term B Loan | Secured Debt [Member] | Synthetic LIBOR Rate (one month)
Debt Instrument [Line Items]
Basis spread on variable rate		0.11448%
Cablevision Lightpath Term B Loan | Secured Debt [Member] | Synthetic LIBOR Rate (six months)
Debt Instrument [Line Items]
Basis spread on variable rate		0.42826%
Cablevision Lightpath Term B Loan | Secured Debt [Member] | Alternate base Rate
Debt Instrument [Line Items]
Basis spread on variable rate		2.25%
Incremental Term Loan B-5 | Secured Debt [Member]
Debt Instrument [Line Items]
Principal amount	2,857,500,000	$ 2,857,500,000	2,887,500,000
Line of credit facility, periodic payment amount	7,500,000
Credit facility	2,849,460,000	$ 2,849,460,000	2,876,131,000
Incremental Term Loan B-5 | Secured Debt [Member] | libor
Debt Instrument [Line Items]
Basis spread on variable rate		250.00%
Incremental Term Loan B-5 | Secured Debt [Member] | Alternate base Rate
Debt Instrument [Line Items]
Basis spread on variable rate		1.50%
Incremental Term Loan B-6 | Secured Debt [Member]
Debt Instrument [Line Items]
Principal amount	1,966,908,000	$ 1,966,908,000	1,986,928,000
Line of credit facility, periodic payment amount	5,005,000
Credit facility	1,936,863,000	$ 1,936,863,000	1,948,503,000
Incremental Term Loan B-6 | Secured Debt [Member] | libor
Debt Instrument [Line Items]
Basis spread on variable rate		4.50%
Revolving Credit Facility | Secured Debt [Member] | Credit Adjustment Spread
Debt Instrument [Line Items]
Basis spread on variable rate		0.10%
CSC Holdings Term Loan B | Secured Debt [Member]
Debt Instrument [Line Items]
Principal amount	0	$ 0	1,520,483,000
Loss (gain) on extinguishment of debt and write-off of deferred financing costs		2,598,000	575,000
Credit facility	$ 0	$ 0	1,518,530,000
CSC Credit Facilities
Debt Instrument [Line Items]
Line of credit facility, covenant, leverage ratio	5.0	5.0
Loans Payable
Debt Instrument [Line Items]
Principal amount	$ 50,642,000	$ 50,642,000	174,454,000	$ 123,880,000
Proceeds from Loans		50,642,000	213,325,000
Repayments of Debt		(174,454,000)	(162,751,000)
CSC Holdings Term Loans B and B-3
Debt Instrument [Line Items]
Deferred Debt Issuance Cost, Writeoff		$ 2,598,000
5.25% Notes due June 1, 2024
Debt Instrument [Line Items]
Stated interest rate	5.25%	5.25%
Deferred Debt Issuance Cost, Writeoff		$ 4,437,000
Senior Notes | CSC Holdings 5.750% Notes due January 15, 2030
Debt Instrument [Line Items]
Principal amount	$ 2,250,000,000	$ 2,250,000,000
Stated interest rate	5.75%	5.75%
Senior Notes | CSC Holdings 4.625% Notes due December 1, 2030
Debt Instrument [Line Items]
Principal amount	$ 2,325,000,000	$ 2,325,000,000
Stated interest rate	4.625%	4.625%
Senior Notes | Cablevision Lightpath LLC 5.625% Notes due September 15, 2028
Debt Instrument [Line Items]
Principal amount			415,000,000
Stated interest rate	5.625%	5.625%
Senior Notes | Cablevision 7.500% Notes due April 1, 2028
Debt Instrument [Line Items]
Principal amount	$ 4,118,000	$ 4,118,000
Stated interest rate	7.50%	7.50%
Senior Notes | CSC Holdings 5.000% Notes due November 15, 2031
Debt Instrument [Line Items]
Principal amount	$ 500,000,000	$ 500,000,000
Stated interest rate	5.00%	5.00%
Senior Notes | CSC Holdings 11.2500% Senior Guaranteed Notes due May 15, 2028
Debt Instrument [Line Items]
Principal amount						$ 1,000,000,000
Stated interest rate						11.25%
Senior Notes | 5.25% Notes due June 1, 2024
Debt Instrument [Line Items]
Principal amount	$ 750,000,000	$ 750,000,000
Loss (gain) on extinguishment of debt and write-off of deferred financing costs		$ 4,437,000
Secured Debt [Member] | 5.5% Notes due April 15, 2027
Debt Instrument [Line Items]
Principal amount			1,310,000,000
Stated interest rate	5.50%	5.50%
Secured Debt [Member] | CSC Holdings 4.125% Notes due December 1, 2030
Debt Instrument [Line Items]
Principal amount			1,100,000,000
Stated interest rate	4.125%	4.125%
Secured Debt [Member] | CSC Holdings 3.375% Notes due February 15, 2031
Debt Instrument [Line Items]
Principal amount			1,000,000,000
Stated interest rate	3.375%	3.375%
Secured Debt [Member] | Cablevision Lightpath LLC 3.875% Notes due September 15, 2027
Debt Instrument [Line Items]
Principal amount			450,000,000
Stated interest rate	3.875%	3.875%
Secured Debt [Member] | CSC Holdings 4.500% Senior Guaranteed Notes due November 15, 2031
Debt Instrument [Line Items]
Principal amount			1,500,000,000
Stated interest rate	4.50%	4.50%
Secured Debt [Member] | CSC Holdings 11.7500% Senior Guaranteed Notes due Jan 31, 2029
Debt Instrument [Line Items]
Principal amount	$ 2,050,000,000	$ 2,050,000,000
Stated interest rate	11.75%	11.75%
Long-term Debt
Debt Instrument [Line Items]
Principal amount	$ 24,910,939,000	$ 24,910,939,000	$ 24,767,198,000