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DEBT - Credit Silo Combination (Details) - USD ($) | Mar. 31, 2022 | Dec. 31, 2021
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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

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