INCOME TAXES - Deferred Tax Assets (Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
NOLs, capital loss, and tax credit carry forwards	$ 171,707	$ 75,912
Compensation and benefit plans	63,870	57,198
Deferred Tax Assets, Investment in Subsidiaries	(143,908)	(118,150)
Restructuring liability	2,208	7,169
Other liabilities	40,946	49,363
Liabilities under derivative contracts	475,970	510,519
Interest deferred for tax purposes	63,402	38,100
Operating lease liability	65,538	70,648
Other	0	199
Deferred tax assets	883,641	809,108
Less: Valuation allowance	(53,384)	(39,811)
Net deferred tax assets, noncurrent	830,257	769,297
Fixed assets and intangibles	(4,955,405)	(4,979,333)
Operating lease asset	(51,494)	(56,363)
Investments	(559,919)	(587,184)
Prepaid expenses	(13,042)	(12,755)
Fair value adjustments related to debt and deferred financing costs	(11,985)	(21,679)
Opportunity Zone tax deferral	(142,631)	0
Deferred tax liability, noncurrent	(5,878,384)	(5,775,464)
Total net deferred tax liabilities	(5,048,127)	(5,006,167)
CSC Holdings
NOLs, capital loss, and tax credit carry forwards	134,260	30,745
Compensation and benefit plans	63,870	57,198
Deferred Tax Assets, Investment in Subsidiaries	(143,908)	(118,150)
Restructuring liability	2,208	7,169
Other liabilities	40,946	49,363
Liabilities under derivative contracts	475,970	510,519
Interest deferred for tax purposes	63,402	38,100
Operating lease liability	65,538	70,648
Other	0	199
Deferred tax assets	846,194	763,941
Less: Valuation allowance	(35,251)	(22,457)
Net deferred tax assets, noncurrent	810,943	741,484
Fixed assets and intangibles	(4,955,405)	(4,979,333)
Operating lease asset	(51,494)	(56,363)
Investments	(559,919)	(587,184)
Prepaid expenses	(13,042)	(12,755)
Fair value adjustments related to debt and deferred financing costs	(11,985)	(21,679)
Opportunity Zone tax deferral	(142,631)	0
Deferred tax liability, noncurrent	(5,878,384)	(5,775,464)
Total net deferred tax liabilities	$ (5,067,441)	$ (5,033,980)