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DEBT - Senior Guaranteed Notes, Senior Secured Notes, and Senior Notes and Debentures (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2020 | Jun. 30, 2021 | Mar. 31, 2021 | Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Principal amount |  | $ 27,158,633,000 |  |  |  | $ 27,158,633,000 |  | $ 26,940,911,000
Long-term debt |  | 26,989,068,000 |  |  |  | 26,989,068,000 |  | 26,722,342,000
Loss on extinguishment of debt and write-off of deferred financing costs |  | 51,712,000 |  | $ 0 |  | 51,712,000 | $ 0 |
Stock Issued During Period, Value, New Issues |  | 8,885,000 | $ 2,044,000 | $ 1,965,000 | $ 2,507,000 |  |  |
Collateralized Agreements |  | 122,176,000 |  |  |  | 122,176,000 |  |
Notes Payable that will be reclassed to collateralized debt upon maturity |  | $ 59,451,000 |  |  |  | $ 59,451,000 |  |
Cablevision Lightpath LLC | Cablevision Lightpath LLC |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Ownership percentage of noncontrolling interest |  | 50.01% |  |  |  | 50.01% |  |
CSC Holdings Revolving Credit Facility, Portion Due October 9, 2020 | Revolving Credit Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | $ 200,000 |  |  |  | $ 200,000 |  |
Cablevision Lightpath Revolving Credit Facility | Revolving Credit Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Principal amount |  | 0 |  |  |  | 0 |  | 0
Line of Credit Facility, Maximum Borrowing Capacity |  | 100,000,000 |  |  |  | 100,000,000 |  |
Cablevision Lightpath Term B Loan | Secured Debt [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Principal amount |  | 597,000,000 |  |  |  | 597,000,000 |  | 600,000,000
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 |  | 2,250,000,000
Stated interest rate |  | 5.75% |  |  |  | 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% |  |  |  | 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% |  |  |  | 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 |  | 1,310,000,000
Stated interest rate |  | 5.50% |  |  |  | 5.50% |  |
Secured Debt [Member] | CSC Holdings 5.500% Notes due May 15, 2026 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Principal amount |  | $ 0 |  |  |  | $ 0 |  | 1,498,806,000
Stated interest rate |  | 5.50% |  |  |  | 5.50% |  |
Long-term Debt |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Principal amount |  | $ 25,857,440,000 |  |  |  | $ 25,857,440,000 |  | $ 25,685,115,000

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