DEBT - Credit Facilities Narrative (Details) - USD ($)	1 Months Ended	6 Months Ended
	Jan. 31, 2018	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Line of Credit Facility [Line Items]
Proceeds from credit facility debt, net of discounts		$ 1,642,500,000	$ 4,977,425,000
Principal Amount		5,722,350,000		$ 4,693,675,000
Repayment of credit facility debt		621,325,000	$ 3,573,750,000
CSC Holdings Revolving Credit Facility | Revolving Credit Facility
Line of Credit Facility [Line Items]
Proceeds from credit facility debt, net of discounts	$ 150,000,000
Principal Amount		0		450,000,000
Repayment of credit facility debt	600,000,000
CSC Holdings Term Loan Facility | Term Loan
Line of Credit Facility [Line Items]
Principal Amount	$ 1,500,000,000	$ 2,970,000,000		$ 2,985,000,000
Debt issued percentage of par	99.50%
CSC Holdings Term Loan Facility | Term Loan | Base Rate
Line of Credit Facility [Line Items]
basis spread on variable rate	1.50%
CSC Holdings Term Loan Facility | Term Loan | Eurodollar
Line of Credit Facility [Line Items]
basis spread on variable rate	2.50%