DEBT - Credit Silo Combination (Details) - USD ($)	Mar. 31, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Principal amount	$ 26,544,747,000	$ 26,671,018,000
Face Amount of Senior Notes	7,524,024,000	7,524,024,000
Carrying amount of Senior Notes	7,549,800,000	7,543,137,000
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	7,636,312,000	7,635,633,000
Face amount of Credit Facility Debt	7,774,250,000	7,952,438,000
Carrying value of Credit Facility Debt	7,740,569,000	7,916,492,000
Senior Notes, Current	(639,996,000)	(635,310,000)
Long-term debt	26,440,831,000	26,546,760,000
Finance Lease, Liability	237,082,000	218,735,000
Debt	969,413,000	917,313,000
Finance Lease, Liability, Current	121,201,000	109,204,000
Long-term debt, net of current maturities	25,471,418,000	25,629,447,000
Cablevision Lightpath
Debt Instrument [Line Items]
Carrying amount of Senior Notes and Senior Secured Notes	1,427,594,000	1,427,962,000
Face Amount of Senior Notes and Senior Secured Notes	1,457,500,000	1,459,000,000
Loans Payable
Debt Instrument [Line Items]
Principal amount		94,049,000
Long-term debt	129,466,000	94,049,000
Credit Facility [Domain]
Debt Instrument [Line Items]
Principal amount		78,750,000
Debt	78,750,000	78,750,000
Short-term Debt
Debt Instrument [Line Items]
Principal amount	978,441,000	931,027,000
Debt	969,413,000	917,313,000
Senior Notes
Debt Instrument [Line Items]
Principal amount	649,024,000	649,024,000
Incremental Term Loan B-3 | Secured Debt [Member]
Debt Instrument [Line Items]
Principal amount	$ 1,236,750,000	1,239,938,000
Stated interest rate	2.647%
Credit facility	$ 1,233,418,000	1,236,394,000
CSC Holdings Revolving Credit Facility | Revolving Credit Facility
Debt Instrument [Line Items]
Principal amount	$ 740,000,000	900,000,000
Stated interest rate	2.647%
Credit facility	$ 734,574,000	893,864,000
CSC Holdings Term Loan B | Secured Debt [Member]
Debt Instrument [Line Items]
Principal amount	$ 2,857,500,000	2,865,000,000
Stated interest rate	2.647%
Credit facility	$ 2,849,508,000	2,856,421,000
Incremental Term Loan B-5 | Secured Debt [Member]
Debt Instrument [Line Items]
Principal amount	$ 2,940,000,000	2,947,500,000
Stated interest rate	2.897%
Credit facility	$ 2,923,069,000	2,929,813,000
Secured Debt [Member]
Debt Instrument [Line Items]
Principal amount	1,759,017,000	1,759,017,000
Long-term debt	1,716,600,000	1,706,997,000
Loans Payable
Debt Instrument [Line Items]
Principal amount	132,874,000	97,804,000
Long-term debt	132,874,000	97,804,000
Cablevision Lightpath Term B Loan | Secured Debt [Member]
Debt Instrument [Line Items]
Principal amount	$ 592,500,000	594,000,000
Stated interest rate	3.75%
Credit facility	$ 578,195,000	579,119,000
Cablevision Lightpath Revolving Credit Facility | Revolving Credit Facility
Debt Instrument [Line Items]
Principal amount	0	0
Credit facility	0	0
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	$ 997,040,000	996,970,000
Stated interest rate	3.375%
Senior Notes | 5.875% Notes due September 15, 2022
Debt Instrument [Line Items]
Principal amount	$ 649,024,000	649,024,000
Outstanding debt	$ 639,996,000	635,310,000
Stated interest rate	5.875%
Senior Notes | 5.25% Notes due June 1, 2024
Debt Instrument [Line Items]
Principal amount	$ 750,000,000	750,000,000
Outstanding debt	$ 714,781,000	711,137,000
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	$ 4,113,000	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	$ 1,044,622,000	1,044,582,000
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	$ 2,282,054,000	2,282,875,000
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	$ 2,365,965,000	2,366,886,000
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	$ 407,342,000	407,104,000
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	$ 498,269,000	498,234,000
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	$ 1,494,815,000	1,494,710,000
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	$ 1,306,649,000	1,306,508,000
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	$ 994,459,000	994,262,000
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	$ 1,747,579,000	1,747,511,000
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	$ 1,095,770,000	1,095,672,000
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	$ 442,057,000	441,739,000
Stated interest rate	3.875%
Long-term Debt
Debt Instrument [Line Items]
Principal amount	$ 25,566,306,000	25,739,991,000
Long-term debt, net of current maturities	$ 25,471,418,000	$ 25,629,447,000