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DEBT - CSC Holdings Credit Facilities (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
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
Loss on extinguishment of debt and write-off of deferred financing costs | 51,712,000 |  | $ 0 |  | 51,712,000 | $ 0 |
Proceeds from long-term debt |  |  |  |  | 3,160,000,000 | 1,925,000,000 |
Repayments of line of credit |  |  |  |  | 3,057,469,000 | 277,114,000 |
Loss on extinguishment of debt and write-off of deferred financing costs | (51,712,000) |  | 0 |  | (51,712,000) | 0 |
CSC Holdings |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Loss on extinguishment of debt and write-off of deferred financing costs | 51,712,000 |  | 0 |  | 51,712,000 | 0 |
Cash distributions to parent | 184,478,000 | $ 501,000,000 | 652,383,000 | $ 720,350,000 | 685,478,000 | 1,372,733,000 |
Proceeds from long-term debt |  |  |  |  | 3,160,000,000 | 1,925,000,000 |
Repayments of line of credit |  |  |  |  | 3,057,469,000 | 277,114,000 |
Loss on extinguishment of debt and write-off of deferred financing costs | (51,712,000) |  | $ 0 |  | (51,712,000) | $ 0 |
5.5% Notes due April 15, 2027 | Secured Debt [Member] |  |  |  |  |  |  |
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% |  |
8.0% Notes due April 15, 2020 | Senior Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Principal amount | $ 1,000,000,000 |  |  |  | $ 1,000,000,000 |  | 1,000,000,000
Stated interest rate | 3.375% |  |  |  | 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 | $ 1,246,313,000 |  |  |  | $ 1,246,313,000 |  | 1,252,688,000
Secured Debt [Member] | Incremental Term Loan B-5 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Principal amount | 2,962,500,000 |  |  |  | $ 2,962,500,000 |  | 2,977,500,000
Secured Debt [Member] | CSC Holdings Revolving Credit Facility - Non-Extend Creditors [Member] | LIBOR |  |  |  |  |  |  |
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 |  |  |  | $ 2,475,000,000 |  |
Principal amount | $ 325,000,000 |  |  |  | $ 325,000,000 |  | $ 625,000,000

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