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DEBT - Senior Guaranteed Notes and Senior Notes and Debentures (Details) - USD ($) |  | 1 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Jun. 21, 2016 | Apr. 30, 2018 | Feb. 28, 2018 | Sep. 30, 2018 | Dec. 31, 2017
Debt Instrument [Line Items] |  |  |  |  |
Principal Amount |  |  |  | $ 6,282,938,000 | $ 4,693,675,000
Carrying Amount |  |  |  | 15,355,738,000 | 15,860,432,000
Less: current portion |  |  |  | 531,206,000 | 507,744,000
Long-term debt |  |  |  | 14,824,532,000 | 15,352,688,000
Senior Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal Amount |  |  |  | $ 15,739,245,000 | 16,289,245,000
Senior Notes | 7.875% Notes due February 15, 2018 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest Rate |  |  |  | 7.875% |
Principal Amount |  |  |  | $ 0 | 300,000,000
Carrying Amount |  |  |  | $ 0 | 301,184,000
Senior Notes | CSC Holdings 7.625% Notes due July 15, 2018 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest Rate |  |  |  | 7.625% |
Principal Amount |  |  |  | $ 0 | 500,000,000
Carrying Amount |  |  |  | $ 0 | 507,744,000
Senior Notes | 8.625% Notes due February 15, 2019 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest Rate |  |  |  | 8.625% |
Principal Amount |  |  |  | $ 526,000,000 | 526,000,000
Carrying Amount |  |  |  | $ 531,206,000 | 541,165,000
Senior Notes | 6.75% Notes due November 15, 2021 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest Rate |  |  |  | 6.75% |
Principal Amount |  |  |  | $ 1,000,000,000 | 1,000,000,000
Carrying Amount |  |  |  | $ 966,913,000 | 960,146,000
Senior Notes | 5.25% Notes due June 1, 2024 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest Rate |  |  |  | 5.25% |
Principal Amount |  |  |  | $ 750,000,000 | 750,000,000
Carrying Amount |  |  |  | $ 668,918,000 | 660,601,000
Senior Notes | 10.125% Notes due January 15, 2023 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest Rate |  |  |  | 10.125% |
Principal Amount |  |  |  | $ 1,800,000,000 | 1,800,000,000
Carrying Amount |  |  |  | $ 1,780,504,000 | 1,777,914,000
Senior Notes | Senior Notes due in 2025 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Redemption Price, Percentage |  |  |  | 100.00% |
Senior Notes | 10.875% Notes due October 15, 2025 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest Rate |  |  |  | 10.875% |
Principal Amount |  |  |  | $ 1,684,221,000 | 1,684,221,000
Carrying Amount |  |  |  | $ 1,662,507,000 | 1,661,135,000
Senior Notes | 6.625% Notes due October 15, 2025 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest Rate |  |  |  | 6.625% |
Principal Amount |  |  |  | $ 1,000,000,000 | 1,000,000,000
Carrying Amount |  |  |  | $ 987,707,000 | 986,717,000
Senior Notes | 5.5% Notes due April 15, 2027 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest Rate |  |  |  | 5.50% |
Principal Amount |  |  |  | $ 1,310,000,000 | 1,310,000,000
Carrying Amount |  |  |  | $ 1,304,816,000 | 1,304,468,000
Debt Instrument, Redemption Price, Percentage |  |  |  | 105.50% |
Senior Notes | 5.375% Notes Due February 1, 2028 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest Rate |  |  |  | 5.375% |
Principal Amount |  |  |  | $ 1,000,000,000 | 0
Carrying Amount |  |  |  | $ 991,896,000 | 0
Debt Instrument, Redemption Price, Percentage |  |  |  | 105.375% |
Senior Notes | 7.75% Notes due April 15, 2018 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest Rate |  |  |  | 7.75% |
Principal Amount |  |  |  | $ 0 | 750,000,000
Carrying Amount |  |  |  | $ 0 | 754,035,000
Extinguishment of debt |  |  | $ 7,019,000 |  |
Senior Notes | 8.0% Notes due April 15, 2020 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest Rate |  |  |  | 8.00% |
Principal Amount |  |  |  | $ 500,000,000 | 500,000,000
Carrying Amount |  |  |  | $ 494,445,000 | 492,009,000
Senior Notes | 5.875% Notes due September 15, 2022 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest Rate |  |  |  | 5.875% |
Principal Amount |  |  |  | $ 649,024,000 | 649,024,000
Carrying Amount |  |  |  | $ 582,236,000 | 572,071,000
Senior Notes | Cequel and Cequel Capital 6.375% Senior Notes due September 15, 2020 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest Rate |  |  |  | 6.375% |
Principal Amount |  |  |  | $ 0 | 1,050,000,000
Carrying Amount |  |  |  | $ 0 | 1,027,493,000
Extinguishment of debt |  | $ 16,737,000 |  |  |
Senior Notes | Cequel and Cequel Capital 5.125% Senior Notes due December 15, 2021 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest Rate |  |  |  | 5.125% |
Principal Amount |  |  |  | $ 1,250,000,000 | 1,250,000,000
Carrying Amount |  |  |  | $ 1,157,405,000 | 1,138,870,000
Senior Notes | Cequel and Cequel Capital 7.75% Senior Notes due July 15, 2025 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest Rate |  |  |  | 7.75% |
Principal Amount |  |  |  | $ 620,000,000 | 620,000,000
Carrying Amount |  |  |  | $ 605,540,000 | 604,374,000
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed |  |  |  | 40.00% |
Debt Instrument, Redemption Price, Percentage |  |  |  | 107.75% |
Senior Notes | Cequel and Cequel Capital 7.5% Senior Notes due April 1, 2028 [Member] [Domain] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest Rate |  |  |  | 7.50% |
Principal Amount |  |  |  | $ 1,050,000,000 | 0
Carrying Amount |  |  |  | $ 1,048,222,000 | 0
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed |  |  |  | 40.00% |
Debt Instrument, Redemption Price, Percentage |  |  |  | 107.50% |
Senior Notes | Altice US Finance I Corporation Senior Secured Notes 5.375% Senior Notes due July 15, 2023 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest Rate |  |  |  | 5.375% |
Principal Amount |  |  |  | $ 1,100,000,000 | 1,100,000,000
Carrying Amount |  |  |  | $ 1,084,542,000 | 1,082,482,000
Senior Notes | Cequel and Cequel Capital 5.5% Senior Notes due May 15, 2026 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest Rate |  |  |  | 5.50% |
Principal Amount |  |  |  | $ 1,500,000,000 | 1,500,000,000
Carrying Amount |  |  |  | $ 1,488,881,000 | $ 1,488,024,000
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed |  |  |  | 40.00% |
Debt Instrument, Redemption Price, Percentage |  |  |  | 105.50% |
Cablevision | Senior Notes | CSC Holdings Senior Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed |  |  |  | 40.00% |
Adjustment to fair value | $ 52,788,000 |  |  |  |
Cablevision | Senior Notes | 10.125% Notes due January 15, 2023 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Redemption Price, Percentage |  |  |  | 110.125% |
Cablevision | Senior Notes | 10.875% Notes due October 15, 2025 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Redemption Price, Percentage |  |  |  | 110.875% |
Cablevision | Senior Notes | 6.625% Notes due October 15, 2025 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Redemption Price, Percentage |  |  |  | 106.625% |

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