DEBT - CSC Holdings Credit Facilities (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2020
Debt Instrument [Line Items]
Principal amount	$ 25,096,412	$ 25,096,412	$ 25,126,605
Loss (gain) on extinguishment of debt and write-off of deferred financing costs		12,901	(4,393)	$ 575
Gain (loss) on extinguishment of debt and write-off of deferred financing costs		(12,901)	4,393	(575)
Repayment of debt		4,223,233	2,688,009	4,469,727
CSC Holdings
Debt Instrument [Line Items]
Loss (gain) on extinguishment of debt and write-off of deferred financing costs		12,901	(4,393)	575
Gain (loss) on extinguishment of debt and write-off of deferred financing costs		(12,901)	4,393	(575)
Repayment of debt		$ 4,225,233	2,688,009	$ 4,469,727
5.5% Notes due April 15, 2027 | Secured Debt [Member]
Debt Instrument [Line Items]
Principal amount			1,310,000
Stated interest rate	5.50%	5.50%
CSC Credit Facilities
Debt Instrument [Line Items]
Percentage of proceeds from asset sales required to pay down term loans		100.00%
Percentage of excess cash flow required when minimum leverage ratio is not met		50.00%
Percentage of excess cash flow required to pay down term loans when minimum leverage ratio is fulfilled		0.00%
Minimum debt leverage ratio required for zero percent of excess cash flow obligation to prepay debt		4.5
Line of credit facility, covenant, leverage ratio	5.0	5.0
Cablevision Lightpath Term B Loan
Debt Instrument [Line Items]
Senior secured ratio	7.30	7.30
5.25% Notes due June 1, 2024
Debt Instrument [Line Items]
Stated interest rate	5.25%	5.25%
5.25% Notes due June 1, 2024 | Senior Notes
Debt Instrument [Line Items]
Principal amount	$ 750,000	$ 750,000
Loss (gain) on extinguishment of debt and write-off of deferred financing costs		4,437
Gain (loss) on extinguishment of debt and write-off of deferred financing costs		$ (4,437)
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 (one month)
Debt Instrument [Line Items]
Basis spread on variable rate		0.11448%
Secured Debt [Member] | Synthetic LIBOR Rate (six months)
Debt Instrument [Line Items]
Basis spread on variable rate		0.42826%
Secured Debt [Member] | CSC Holdings Revolving Credit Facility | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
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	0	$ 0	521,744
Secured Debt [Member] | Incremental Term Loan B-5
Debt Instrument [Line Items]
Principal amount	2,857,500	$ 2,857,500	2,887,500
Line of credit facility, periodic payment amount	7,500
Secured Debt [Member] | Incremental Term Loan B-5 | Alternate base Rate
Debt Instrument [Line Items]
Basis spread on variable rate		1.50%
Secured Debt [Member] | Incremental Term Loan B-5 | libor
Debt Instrument [Line Items]
Basis spread on variable rate		250.00%
Secured Debt [Member] | CSC Holdings Term Loan B
Debt Instrument [Line Items]
Principal amount	0	$ 0	1,520,483
Loss (gain) on extinguishment of debt and write-off of deferred financing costs		2,598	575
Gain (loss) on extinguishment of debt and write-off of deferred financing costs		(2,598)	(575)
Secured Debt [Member] | Incremental Term Loan B-6
Debt Instrument [Line Items]
Principal amount	1,966,908	$ 1,966,908	1,986,928
Line of credit facility, periodic payment amount	5,005
Secured Debt [Member] | Incremental Term Loan B-6 | libor
Debt Instrument [Line Items]
Basis spread on variable rate		4.50%
Secured Debt [Member] | Cablevision Lightpath Term B Loan
Debt Instrument [Line Items]
Principal amount	676,000	$ 676,000	582,000		$ 600,000
Loss (gain) on extinguishment of debt and write-off of deferred financing costs		5,866
Line of credit facility, periodic payment amount	1,760
Debt discount rate					99.50%
Gain (loss) on extinguishment of debt and write-off of deferred financing costs		$ (5,866)
Secured Debt [Member] | Cablevision Lightpath Term B Loan | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Debt Instrument [Line Items]
Basis spread on variable rate		3.25%
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 | Fed Rate, Prime Rate and Alternate Base Rate
Debt Instrument [Line Items]
Basis spread on variable rate		50.00%
Secured Debt [Member] | Cablevision Lightpath Term B Loan | Synthetic LIBOR Rate (one month)
Debt Instrument [Line Items]
Basis spread on variable rate		0.11448%
Secured Debt [Member] | Cablevision Lightpath Term B Loan | Synthetic LIBOR Rate (six months)
Debt Instrument [Line Items]
Basis spread on variable rate		0.42826%
Secured Debt [Member] | Cablevision Lightpath Term B Loan | Secured Overnight Financing Rate (SOFR)
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	$ 2,475,000
Principal amount	1,700,000	1,700,000	825,000
Proceeds from long-term debt		2,025,000
Repayments of line of credit		1,150,000
Line of credit facility, remaining borrowing capacity	611,262	611,262
Revolving Credit Facility | Cablevision Lightpath Revolving Credit Facility
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	115	115			$ 100,000
Principal amount	$ 0	0	$ 0
Proceeds from long-term debt		40
Repayments of line of credit		$ 40