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DEBT - Senior Guaranteed Notes, Senior Secured Notes, and Senior Notes and Debentures (Details) - USD ($) | 1 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Mar. 31, 2022 | Mar. 31, 2021 | Dec. 31, 2021
Debt Instrument [Line Items] |  |  |  |
Principal amount |  | $ 26,544,747,000 |  | $ 26,671,018,000
Long-term debt |  | 26,440,831,000 |  | 26,546,760,000
Issuance of common shares pursuant to employee long term incentive plan |  | 10,000 | $ 2,044,000 |
Notes Payable that will be reclassed to collateralized debt upon maturity |  | $ 59,451,000 |  |
Cablevision Lightpath LLC | Cablevision Lightpath LLC |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Ownership percentage of noncontrolling interest |  | 50.01% |  |
Cablevision Lightpath Revolving Credit Facility | Revolving Credit Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal amount |  | $ 0 |  | 0
Cablevision Lightpath Term B Loan | Secured Debt [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal amount |  | 592,500,000 |  | 594,000,000
Line of Credit Facility, Maximum Borrowing Capacity |  | 100,000,000 |  |
Cablevision Lightpath Term B Loan | Secured Debt [Member] | Alternate Base Rate |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread on variable rate | 2.25% |  |  |
Cablevision Lightpath Term B Loan | Secured Debt [Member] | Eurodollar |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread on variable rate | 3.25% |  |  |
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
Stated interest rate |  | 5.75% |  |
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
Stated interest rate |  | 4.50% |  |
Senior Notes | CSC Holdings 5.000% Notes due November 15, 2031 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal amount |  | $ 500,000,000 |  | 500,000,000
Stated interest rate |  | 5.00% |  |
Secured Debt [Member] | 5.5% Notes due April 15, 2027 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal amount |  | $ 1,310,000,000 |  | 1,310,000,000
Stated interest rate |  | 5.50% |  |
Long-term Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal amount |  | $ 25,566,306,000 |  | $ 25,739,991,000

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