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DEBT - Senior Guaranteed Notes and Senior Notes and Debentures Narrative (Details) - USD ($) |  |  | 1 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
May 24, 2018 | Jan. 08, 2018 | 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
Dividends | $ 2.035 | $ 1,499,935,000 |  |  | 1,499,935,000 |
Senior Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Principal Amount |  |  |  |  | $ 15,739,245,000 | 16,289,245,000
Senior Notes | Cequel and Cequel Capital 7.5% Senior Notes due April 1, 2028 [Member] [Domain] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed |  |  |  |  | 40.00% |
Debt Instrument, Redemption Price, Percentage |  |  |  |  | 107.50% |
Principal Amount |  |  |  |  | $ 1,050,000,000 | 0
Interest Rate |  |  |  |  | 7.50% |
Senior Notes | 5.375% Notes Due February 1, 2028 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage |  |  |  |  | 105.375% |
Principal Amount |  |  |  |  | $ 1,000,000,000 | 0
Interest Rate |  |  |  |  | 5.375% |
Senior Notes | 7.875% Notes due February 15, 2018 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Principal Amount |  |  |  |  | $ 0 | 300,000,000
Interest Rate |  |  |  |  | 7.875% |
Senior Notes | 7.75% Notes due April 15, 2018 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Principal Amount |  |  |  |  | $ 0 | 750,000,000
Interest Rate |  |  |  |  | 7.75% |
Extinguishment of debt |  |  |  | $ 7,019,000 |  |
Write Off Of Deferred Debt Issuance Cots and Unamortized Discount |  |  |  | $ 2,314,000 |  |
Senior Notes | Cequel and Cequel Capital 6.375% Senior Notes due September 15, 2020 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Principal Amount |  |  |  |  | $ 0 | $ 1,050,000,000
Interest Rate |  |  |  |  | 6.375% |
Extinguishment of debt |  |  | $ 16,737,000 |  |  |
Write Off Of Deferred Debt Issuance Cots and Unamortized Discount |  |  | $ 20,173,000 |  |  |

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