INTANGIBLE ASSETS - Summary of Acquired Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 7,253,150	$ 7,190,428
Accumulated Amortization	(5,051,149)	(4,409,312)
Amortizable intangibles, net of accumulated amortization of $5,051,149 and $4,409,312	2,202,001	2,781,116
CSC Holdings
Acquired Finite-Lived Intangible Assets [Line Items]
Accumulated Amortization	5,051,149	4,409,312
Amortizable intangibles, net of accumulated amortization of $5,051,149 and $4,409,312	2,202,001	2,781,116
Customer Relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	6,113,669
Customer Relationships [Member] | CSC Holdings
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	6,113,669	6,052,598
Accumulated Amortization	(4,020,282)	(3,478,742)
Amortizable intangibles, net of accumulated amortization of $5,051,149 and $4,409,312	2,093,387	2,573,856
Trade names
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,081,083
Trade names | CSC Holdings
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,081,083	1,081,083
Accumulated Amortization	(988,563)	(894,189)
Amortizable intangibles, net of accumulated amortization of $5,051,149 and $4,409,312	92,520	186,894
Other amortizable intangibles
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	58,398
Other amortizable intangibles | CSC Holdings
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	58,398	56,747
Accumulated Amortization	(42,304)	(36,381)
Amortizable intangibles, net of accumulated amortization of $5,051,149 and $4,409,312	$ 16,094	$ 20,366
Minimum | Customer Relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life	3 years
Minimum | Trade names
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life	2 years
Minimum | Other amortizable intangibles
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life	1 year
Maximum | Customer Relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life	18 years
Maximum | Trade names
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life	10 years
Maximum | Other amortizable intangibles
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life	15 years