DEBT - Credit Silo Combination (Details) - USD ($)	Mar. 31, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Principal amount	$ 25,066,345,000	$ 26,676,545,000
Face Amount of Senior Notes	6,875,000,000	6,875,000,000
Carrying amount of Senior Notes	6,918,327,000	6,916,148,000
Face Amount of Senior Notes and Senior Guaranteed Notes	7,660,000,000	7,660,000,000
Carrying amount of Senior Notes and Senior Guaranteed Notes	7,639,158,000	7,638,443,000
Face amount of Credit Facility Debt	8,669,640,000	8,557,298,000
Carrying value of Credit Facility Debt	8,603,632,000	8,488,017,000
Long-term debt	24,997,611,000	26,587,733,000
Finance Lease, Liability	241,909,000	244,595,000
Debt	373,174,000	2,075,077,000
Finance Lease, Liability, Current	128,369,000	129,657,000
Long-term debt, net of current maturities	24,624,437,000	24,512,656,000
Cablevision Lightpath
Debt Instrument [Line Items]
Carrying amount of Senior Notes and Senior Secured Notes	1,426,289,000	1,426,614,000
Face Amount of Senior Notes and Senior Secured Notes	1,451,500,000	1,453,000,000
Loans Payable
Debt Instrument [Line Items]
Principal amount		127,496,000
Long-term debt	168,157,000	127,496,000
Credit Facility [Domain]
Debt Instrument [Line Items]
Principal amount		71,643,000
Debt	76,648,000	71,643,000
Short-term Debt
Debt Instrument [Line Items]
Principal amount	373,174,000	2,087,813,000
Debt	373,174,000	2,075,077,000
Collateralized Debt Obligations [Member]
Debt Instrument [Line Items]
Principal amount	0	1,759,017,000
Debt Instrument, Collateral Amount	0	1,746,281,000
Incremental Term Loan B-3 | Secured Debt [Member]
Debt Instrument [Line Items]
Principal amount	$ 525,696,000	527,014,000
Stated interest rate	6.934%
Credit facility	$ 524,666,000	525,883,000
CSC Holdings Revolving Credit Facility | Revolving Credit Facility
Debt Instrument [Line Items]
Principal amount	$ 1,700,000,000	1,575,000,000
Stated interest rate	7.177%
Credit facility	$ 1,695,951,000	1,570,730,000
CSC Holdings Term Loan B | Secured Debt [Member]
Debt Instrument [Line Items]
Principal amount	$ 1,532,002,000	1,535,842,000
Stated interest rate	6.934%
Credit facility	$ 1,529,110,000	1,532,644,000
Incremental Term Loan B-5 | Secured Debt [Member]
Debt Instrument [Line Items]
Principal amount	$ 2,910,000,000	2,917,500,000
Stated interest rate	7.184%
Credit facility	$ 2,896,201,000	2,902,921,000
Loans Payable
Debt Instrument [Line Items]
Principal amount	168,296,000	127,635,000
Long-term debt	168,296,000	127,635,000
Cablevision Lightpath Term B Loan | Secured Debt [Member]
Debt Instrument [Line Items]
Principal amount	$ 586,500,000	588,000,000
Stated interest rate	7.934%
Credit facility	$ 574,570,000	575,478,000
Cablevision Lightpath Revolving Credit Facility | Revolving Credit Facility
Debt Instrument [Line Items]
Principal amount	0	0
Credit facility	0	0
Collateralized Debt Obligations [Member]
Debt Instrument [Line Items]
Principal amount	0	1,759,017,000
Long-term debt	0	1,746,281,000
Incremental Term Loan B-6 | Secured Debt [Member]
Debt Instrument [Line Items]
Principal amount	$ 2,001,942,000	2,001,942,000
Stated interest rate	9.327%
Credit facility	$ 1,957,704,000	1,955,839,000
Senior Notes | 8.0% Notes due April 15, 2020
Debt Instrument [Line Items]
Principal amount	1,000,000,000	1,000,000,000
Outstanding debt	$ 997,330,000	997,258,000
Stated interest rate	3.375%
Senior Notes | 5.25% Notes due June 1, 2024
Debt Instrument [Line Items]
Principal amount	$ 750,000,000	750,000,000
Outstanding debt	$ 730,273,000	726,343,000
Stated interest rate	5.25%
Senior Notes | Cablevision 7.500% Notes due April 1, 2028
Debt Instrument [Line Items]
Principal amount	$ 4,118,000	4,118,000
Outstanding debt	$ 4,114,000	4,113,000
Stated interest rate	7.50%
Senior Notes | CSC Holdings 7.500% Notes due April 1, 2028
Debt Instrument [Line Items]
Principal amount	$ 1,045,882,000	1,045,882,000
Outstanding debt	$ 1,044,794,000	1,044,752,000
Stated interest rate	7.50%
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
Outstanding debt	$ 2,278,620,000	2,279,483,000
Stated interest rate	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
Outstanding debt	$ 2,362,114,000	2,363,082,000
Stated interest rate	4.625%
Senior Notes | Cablevision Lightpath LLC 5.625% Notes due September 15, 2028
Debt Instrument [Line Items]
Principal amount	$ 415,000,000	415,000,000
Outstanding debt	$ 408,342,000	408,090,000
Stated interest rate	5.625%
Senior Notes | CSC Holdings 5.000% Notes due November 15, 2031
Debt Instrument [Line Items]
Principal amount	$ 500,000,000	500,000,000
Outstanding debt	$ 498,412,000	498,375,000
Stated interest rate	5.00%
Senior Notes | CSC Holdings 4.500% Senior Guaranteed Notes due November 15, 2021
Debt Instrument [Line Items]
Principal amount	$ 1,500,000,000	1,500,000,000
Outstanding debt	$ 1,495,254,000	1,495,144,000
Stated interest rate	4.50%
Secured Debt [Member] | 5.5% Notes due April 15, 2027
Debt Instrument [Line Items]
Principal amount	$ 1,310,000,000	1,310,000,000
Outstanding debt	$ 1,307,241,000	1,307,091,000
Stated interest rate	5.50%
Secured Debt [Member] | 5.375% Senior Guaranteed Notes Due February 1, 2028
Debt Instrument [Line Items]
Principal amount	$ 1,000,000,000	1,000,000,000
Outstanding debt	$ 995,286,000	995,078,000
Stated interest rate	5.375%
Secured Debt [Member] | CSC Holdings 6.500% Notes due February 1, 2029
Debt Instrument [Line Items]
Principal amount	$ 1,750,000,000	1,750,000,000
Outstanding debt	$ 1,747,868,000	1,747,795,000
Stated interest rate	6.50%
Secured Debt [Member] | CSC Holdings 4.125% Notes due December 1, 2030
Debt Instrument [Line Items]
Principal amount	$ 1,100,000,000	1,100,000,000
Outstanding debt	$ 1,096,179,000	1,096,077,000
Stated interest rate	4.125%
Secured Debt [Member] | Cablevision Lightpath LLC 3.875% Notes due September 15, 2027
Debt Instrument [Line Items]
Principal amount	$ 450,000,000	450,000,000
Outstanding debt	$ 443,377,000	443,046,000
Stated interest rate	3.875%
Long-term Debt
Debt Instrument [Line Items]
Principal amount	$ 24,693,171,000	24,588,732,000
Long-term debt, net of current maturities	$ 24,624,437,000	$ 24,512,656,000