DEBT - Outstanding Debt (Details) - USD ($)	3 Months Ended	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2025	Jul. 16, 2025	Dec. 31, 2024	Dec. 31, 2021
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ (26,407,393,000)	$ (26,407,393,000)		$ (25,096,412,000)
Face Amount of Senior Notes	6,125,000,000	6,125,000,000		6,125,000,000
Carrying amount of Senior Notes	6,166,925,000	6,166,925,000		6,174,932,000
Face Amount of Senior Debt and Senior Secured Debt	10,710,000,000	10,710,000,000		10,710,000,000
Carrying amount of Senior Debt and Senior Secured Debt	10,681,252,000	10,681,252,000		10,673,478,000
Face amount of Credit Facility Debt	4,952,500,000	4,952,500,000		6,524,408,000
Carrying value of Credit Facility Debt	4,946,401,000	4,946,401,000		6,483,882,000
Finance Lease, Liability	105,619,000	105,619,000		145,362,000
Long-term debt	26,206,214,000	26,206,214,000		25,057,488,000
Long-Term Debt, Current Maturities	(60,842,000)	(60,842,000)		(185,473,000)
Long-term debt, net of current maturities	26,145,372,000	26,145,372,000		24,872,015,000
Short-term Debt
Debt Instrument [Line Items]
Debt Instrument, Face Amount	(60,842,000)	(60,842,000)		(185,473,000)
Long-Term Debt, Current Maturities	(60,842,000)	(60,842,000)		(185,473,000)
Cablevision Lightpath
Debt Instrument [Line Items]
Face Amount of Senior Debt and Senior Secured Debt	1,534,183,000	1,534,183,000		1,541,000,000
Carrying amount of Senior Debt and Senior Secured Debt	1,525,949,000	1,525,949,000		1,529,192,000
Long-term Debt
Debt Instrument [Line Items]
Debt Instrument, Face Amount	(26,346,551,000)	(26,346,551,000)		(24,910,939,000)
Long-term debt, net of current maturities	$ 26,145,372,000	$ 26,145,372,000		24,872,015,000
Cablevision 7.500% Notes due April 1, 2028 | Senior Notes
Debt Instrument [Line Items]
Stated interest rate	7.50%	7.50%
Debt Instrument, Face Amount	$ (4,118,000)	$ (4,118,000)
Outstanding debt	$ 4,116,000	$ 4,116,000		4,115,000
CSC Holdings 7.500% Notes due April 1, 2028 | Senior Notes
Debt Instrument [Line Items]
Stated interest rate	7.50%	7.50%
Debt Instrument, Face Amount	$ (1,045,882,000)	$ (1,045,882,000)
Outstanding debt	$ 1,045,342,000	$ 1,045,342,000		1,045,130,000
CSC Holdings 5.750% Notes due January 15, 2030 | Senior Notes
Debt Instrument [Line Items]
Stated interest rate	5.75%	5.75%
Debt Instrument, Face Amount	$ (2,250,000,000)	$ (2,250,000,000)
Outstanding debt	$ 2,268,198,000	$ 2,268,198,000		2,272,150,000
CSC Holdings 5.000% Notes due November 15, 2031 | Senior Notes
Debt Instrument [Line Items]
Stated interest rate	5.00%	5.00%
Debt Instrument, Face Amount	$ (500,000,000)	$ (500,000,000)
Outstanding debt	$ 498,846,000	$ 498,846,000		498,681,000
5.5% Notes due April 15, 2027 | Secured Debt [Member]
Debt Instrument [Line Items]
Stated interest rate	5.50%	5.50%
Debt Instrument, Face Amount				(1,310,000,000)
Outstanding debt	$ 1,309,053,000	$ 1,309,053,000		1,308,363,000
5.375% Senior Guaranteed Notes Due February 1, 2028 | Secured Debt [Member]
Debt Instrument [Line Items]
Stated interest rate	5.375%	5.375%
Debt Instrument, Face Amount				(1,000,000,000)
Outstanding debt	$ 997,814,000	$ 997,814,000		996,853,000
CSC Holdings 4.625% Notes due December 1, 2030 | Senior Notes
Debt Instrument [Line Items]
Stated interest rate	4.625%	4.625%
Debt Instrument, Face Amount	$ (2,325,000,000)	$ (2,325,000,000)
Outstanding debt	$ 2,350,423,000	$ 2,350,423,000		2,354,856,000
CSC Holdings 6.500% Notes due February 1, 2029 | Secured Debt [Member]
Debt Instrument [Line Items]
Stated interest rate	6.50%	6.50%
Debt Instrument, Face Amount				(1,750,000,000)
Outstanding debt	$ 1,748,770,000	$ 1,748,770,000		1,748,423,000
CSC Holdings 4.125% Notes due December 1, 2030 | Secured Debt [Member]
Debt Instrument [Line Items]
Stated interest rate	4.125%	4.125%
Debt Instrument, Face Amount				(1,100,000,000)
Outstanding debt	$ 1,097,399,000	$ 1,097,399,000		1,096,940,000
CSC Holdings 3.375% Notes due February 15, 2031 | Secured Debt [Member]
Debt Instrument [Line Items]
Stated interest rate	3.375%	3.375%
Debt Instrument, Face Amount				(1,000,000,000)
Outstanding debt	$ 998,183,000	$ 998,183,000		997,864,000
CSC Holdings 4.500% Senior Guaranteed Notes due November 15, 2031 | Secured Debt [Member]
Debt Instrument [Line Items]
Stated interest rate	4.50%	4.50%
Debt Instrument, Face Amount				(1,500,000,000)
Outstanding debt	$ 1,496,573,000	$ 1,496,573,000		1,496,075,000
CSC Holdings 11.250% Senior Guaranteed Notes due May 15, 2028 | Secured Debt [Member]
Debt Instrument [Line Items]
Stated interest rate	11.25%	11.25%
Debt Instrument, Face Amount	$ (1,000,000,000)	$ (1,000,000,000)		(1,000,000,000)
Outstanding debt	$ 996,406,000	$ 996,406,000		995,174,000
CSC Holdings 11.7500% Senior Guaranteed Notes due Jan 31, 2029 | Secured Debt [Member]
Debt Instrument [Line Items]
Stated interest rate	11.75%	11.75%
Debt Instrument, Face Amount	$ (2,050,000,000)	$ (2,050,000,000)		(2,050,000,000)
CSC Holdings 11.7500% Senior Guaranteed Notes due Jan 31, 2029 | Senior Subordinated Notes
Debt Instrument [Line Items]
Outstanding debt	2,037,054,000	2,037,054,000		2,033,786,000
CSC Holdings Revolving Credit Facility | Revolving Credit Facility
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ (2,125,000,000)	$ (2,125,000,000)		(1,700,000,000)
Stated interest rate	6.10%	6.10%
Credit facility	$ 2,123,506,000	$ 2,123,506,000		1,697,559,000
Letters of credit outstanding	183,514,000	183,514,000
Line of credit facility, remaining borrowing capacity	166,486,000	166,486,000
Line of Credit Facility, Maximum Borrowing Capacity	2,475,000,000	$ 2,475,000,000
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%
Incremental Term Loan B-5 | Secured Debt [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ (2,827,500,000)	$ (2,827,500,000)		(2,857,500,000)
Stated interest rate	8.25%	8.25%
Credit facility	$ 2,822,895,000	$ 2,822,895,000		2,849,460,000
Line of credit facility, periodic payment amount	7,500,000
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]
Debt Instrument, Face Amount	0	$ 0		(1,966,908,000)
Credit facility	0	$ 0		1,936,863,000
Line of credit facility, periodic payment amount	$ 5,005,000
Incremental Term Loan B-6 | Secured Debt [Member] | libor
Debt Instrument [Line Items]
Basis spread on variable rate		4.50%
Unsub Group Credit Facility | Secured Debt [Member]
Debt Instrument [Line Items]
Stated interest rate	9.00%	9.00%
Debt Instrument, Face Amount	$ (2,000,000,000)	$ (2,000,000,000)		0
Unsub Group Credit Facility | Senior Subordinated Notes
Debt Instrument [Line Items]
Asset-Backed Securities, at Carrying Value	$ 1,898,893,000	$ 1,898,893,000		0
Receivable Facility Loan
Debt Instrument [Line Items]
Stated interest rate			8.875%
Debt Instrument, Face Amount			$ (1,000,000)
Receivable Facility Loan | Secured Debt [Member]
Debt Instrument [Line Items]
Stated interest rate	8.875%	8.875%
Debt Instrument, Face Amount	$ (980,091,000)	$ (980,091,000)		0
Receivable Facility Loan | Senior Subordinated Notes
Debt Instrument [Line Items]
Asset-Backed Securities, at Carrying Value	$ 881,175,000	$ 881,175,000		0
Cablevision Lightpath LLC 5.625% Notes due September 15, 2028 | Senior Notes
Debt Instrument [Line Items]
Stated interest rate	5.625%	5.625%
Debt Instrument, Face Amount				(415,000,000)
Outstanding debt	$ 411,428,000	$ 411,428,000		410,249,000
Cablevision Lightpath LLC 3.875% Notes due September 15, 2027 | Secured Debt [Member]
Debt Instrument [Line Items]
Stated interest rate	3.875%	3.875%
Debt Instrument, Face Amount				(450,000,000)
Outstanding debt	$ 447,320,000	$ 447,320,000		445,836,000
Cablevision Lightpath Term B Loan | Secured Debt [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ (669,183,000)	$ (669,183,000)		(676,000,000)	$ (600,000,000)
Stated interest rate	6.75%	6.75%
Credit facility	$ 667,201,000	$ 667,201,000		673,107,000
Line of credit facility, periodic payment amount	1,760,000
Cablevision Lightpath Term B Loan | Secured Debt [Member] | Fed Rate, Prime Rate and Alternate Base Rate
Debt Instrument [Line Items]
Basis spread on variable rate		50.00%
Cablevision Lightpath Term B Loan | Secured Debt [Member] | Alternate base Rate
Debt Instrument [Line Items]
Basis spread on variable rate		2.25%
Cablevision Lightpath Revolving Credit Facility | Revolving Credit Facility
Debt Instrument [Line Items]
Debt Instrument, Face Amount	0	$ 0		0
Credit facility	0	0		0
Line of Credit Facility, Maximum Borrowing Capacity	115,000	115,000			$ 100,000,000
Cablevision Lightpath Revolving Credit Facility | Cablevision Lightpath Revolving Credit Facility
Debt Instrument [Line Items]
Letters of credit outstanding	18,588,000	18,588,000
Line of credit facility, remaining borrowing capacity	76,412,000	76,412,000
Line of Credit Facility, Maximum Borrowing Capacity	95,000	95,000
Notes Payable and Supply Chain Financing
Debt Instrument [Line Items]
Debt Instrument, Face Amount	0	0		(50,642,000)
Long-term debt	$ 0	$ 0		$ 50,642,000