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DEBT - CSC Holdings Credit Facilities (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
Proceeds from long-term debt |  | 150,000,000 | $ 150,000,000 |
Repayments of line of credit |  | 329,688,000 | 225,863,000 |
CSC Holdings |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Cash distributions to parent |  | 0 | 501,000,000 |
Proceeds from long-term debt |  | 150,000,000 | 150,000,000 |
Repayments of line of credit |  | 329,688,000 | $ 225,863,000 |
5.5% Notes due April 15, 2027 | Secured Debt [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal amount |  | $ 1,310,000,000 |  | 1,310,000,000
Stated interest rate |  | 5.50% |  |
8.0% Notes due April 15, 2020 | Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal amount |  | $ 1,000,000,000 |  | 1,000,000,000
Stated interest rate |  | 3.375% |  |
Secured Debt [Member] | CSC Holdings Revolving Credit Facility | LIBOR |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread on variable rate |  | 2.25% |  |
Secured Debt [Member] | Incremental Term Loan B-3 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal amount |  | $ 1,236,750,000 |  | 1,239,938,000
Secured Debt [Member] | Incremental Term Loan B-5 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal amount |  | 2,940,000,000 |  | 2,947,500,000
Secured Debt [Member] | Cablevision Lightpath Term B Loan |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | 100,000,000 |  |
Principal amount |  | 592,500,000 |  | 594,000,000
Secured Debt [Member] | Cablevision Lightpath Term B Loan | Alternate Base Rate |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread on variable rate | 2.25% |  |  |
Secured Debt [Member] | Cablevision Lightpath Term B Loan | Eurodollar |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread on variable rate | 3.25% |  |  |
Revolving Credit Facility | CSC Holdings Revolving Credit Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | 2,475,000,000 |  |
Principal amount |  | $ 740,000,000 |  | $ 900,000,000

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