DEBT - Senior Guaranteed Notes and Senior Notes and Debentures (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Debt Instrument [Line Items]
Principal amount	$ 24,822,804		$ 24,817,366
Face Amount of Senior Notes and Senior Guaranteed Notes	15,657,497		15,657,497
Carrying amount of Senior Notes and Senior Guaranteed Notes	15,488,589		15,476,496
Face amount of Credit Facility Debt	7,179,750		7,190,438
Carrying value of Credit Facility Debt	7,139,133		7,148,287
Finance Lease, Liability	91,394		69,420
Long-term debt	24,447,335		24,420,285
Long-term Debt, Current Maturities	179,515		170,682
Finance Lease, Liability, Current	30,845		22,017
Long-term Debt, Excluding Current Maturities	24,267,820		24,249,603
Repayments of line of credit	10,688	$ 361,250
Loss on extinguishment of debt and write-off of deferred financing costs	0	$ (157,902)
Loans Payable
Debt Instrument [Line Items]
Principal amount	75,920		83,415
Long-term debt	75,920		83,415
Short-term Debt
Debt Instrument [Line Items]
Principal amount	179,515		170,682
Long-term Debt, Current Maturities	179,515		170,682
Credit Facility [Domain]
Debt Instrument [Line Items]
Principal amount	72,750		65,250
Long-term Debt, Current Maturities	72,750		65,250
Incremental Term Loan B-3 \| Secured Debt [Member]
Debt Instrument [Line Items]
Principal amount	$ 1,262,250		1,265,438
Stated interest rate	2.86%
Credit facility	$ 1,257,221		1,260,200
Incremental Term Loan B-5 \| Secured Debt [Member]
Debt Instrument [Line Items]
Principal amount	$ 3,000,000		3,000,000
Stated interest rate	3.11%
Credit facility	$ 2,977,104		2,976,358
Loans Payable
Debt Instrument [Line Items]
Principal amount	135,146		140,994
Long-term debt	135,146		140,994
Secured Debt [Member]
Debt Instrument [Line Items]
Principal amount	1,759,017		1,759,017
Long-term debt	1,593,073		1,585,088
CSC Holdings Revolving Credit Facility \| Revolving Credit Facility
Debt Instrument [Line Items]
Principal amount	0		0
Line of Credit Facility, Maximum Borrowing Capacity	2,275,000
Credit facility	$ 0		0
Secured Debt [Member] \| 6.625% Notes due October 15, 2025
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	6.625%
Principal amount	$ 1,000,000		1,000,000
Carrying Amount	$ 989,855		989,483
Secured Debt [Member] \| 5.5% Notes due April 15, 2027
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	5.50%
Principal amount	$ 1,310,000		1,310,000
Carrying Amount	$ 1,305,558		1,305,430
Secured Debt [Member] \| 5.375% Senior Guaranteed Notes Due February 1, 2028
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	5.375%
Principal amount	$ 1,000,000		1,000,000
Carrying Amount	$ 992,935		992,757
Secured Debt [Member] \| CSC Holdings 5.375% Senior Guaranteed Notes due July 15, 2023
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	5.375%
Principal amount	$ 1,095,825		1,095,825
Carrying Amount	$ 1,082,771		1,081,879
Secured Debt [Member] \| CSC Holdings 5.500% Notes due May 15, 2026
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	5.50%
Principal amount	$ 1,498,806		1,498,806
Carrying Amount	$ 1,486,333		1,485,911
Secured Debt [Member] \| CSC Holdings 6.500% Notes due February 1, 2029
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	6.50%
Principal amount	$ 1,750,000		1,750,000
Carrying Amount	1,747,057		1,746,996
Long-term Debt
Debt Instrument [Line Items]
Principal amount	24,643,289		24,646,684
Long-term Debt, Excluding Current Maturities	$ 24,267,820		24,249,603
Senior Notes \| 6.75% Notes due November 15, 2021
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	6.75%
Principal amount	$ 1,000,000		1,000,000
Carrying Amount	$ 981,769		979,178
Senior Notes \| 5.25% Notes due June 1, 2024
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	5.25%
Principal amount	$ 750,000		750,000
Carrying Amount	$ 687,105		683,940
Senior Notes \| 10.875% Notes due October 15, 2025
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	10.875%
Principal amount	$ 1,684,221		1,684,221
Carrying Amount	$ 1,665,828		1,665,237
Senior Notes \| CSC Holdings 7.750% Notes due July 15, 2025
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	7.75%
Principal amount	$ 617,881		617,881
Carrying Amount	$ 606,026		605,583
Senior Notes \| CSC Holdings 7.500% Notes due April 1, 2028
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	7.50%
Principal amount	$ 1,045,882		1,045,882
Carrying Amount	$ 1,044,313		1,044,278
Senior Notes \| 5.875% Notes due September 15, 2022
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	5.875%
Principal amount	$ 649,024		649,024
Carrying Amount	$ 604,810		600,849
Senior Notes \| Cablevision 7.750% Notes due July 15, 2025
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	7.75%
Principal amount	$ 1,740		1,740
Carrying Amount	$ 1,698		1,695
Senior Notes \| Cablevision 7.500% Notes due April 1, 2028
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	7.50%
Principal amount	$ 4,118		4,118
Carrying Amount	$ 4,112		4,112
Senior Notes \| CSC Holdings 5.750% Notes due January 15, 2030
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	5.75%
Principal amount	$ 2,250,000		2,250,000
Carrying Amount	$ 2,288,419		$ 2,289,168

Carrying amount of Senior Notes and Senior Guaranteed Notes

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Carrying value of Credit Facility Debt

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Face amount of Credit Facility Debt

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Face Amount of Senior Notes and Senior Guaranteed Notes

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Present value of lessee's discounted obligation for lease payments from finance lease.

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Present value of lessee's discounted obligation for lease payments from finance lease, classified as current.

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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The effective interest rate at the end of the reporting period.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders.

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