CSC HOLDINGS - CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Current Assets:
Cash and cash equivalents	$ 195,711	$ 278,422
Restricted cash	264	264
Accounts receivable, trade (less allowance for doubtful accounts of $27,931 and $25,198)	406,952	442,581
Prepaid expenses and other current assets ($3,776 and $4,262 due from affiliates)	186,707	255,299
Total current assets	789,634	976,566
Property, plant and equipment, net of accumulated depreciation of $7,142,852 and $6,431,843	6,340,467	5,805,996
Right-of-use operating lease assets	222,124	241,342
Investment securities pledged as collateral	2,161,937	2,250,854
Other assets	76,653	92,203
Amortizable intangibles, net of accumulated amortization of $5,051,149 and $4,409,312	2,202,001	2,781,116
Indefinite-lived cable television franchises	13,216,355	13,068,017
Goodwill	8,205,863	8,160,566
Total assets	33,215,034	33,376,660
Current Liabilities:
Accounts payable	1,023,045	795,576
Interest payable	244,934	252,060
Accrued employee related costs	124,941	142,116
Deferred revenue	94,943	109,798
Debt	917,313	1,245,713
Other current liabilities ($31,810 and $8,538 due to affiliates)	329,943	552,840
Total current liabilities	2,735,119	3,098,103
Other liabilities	159,082	192,563
Deferred tax liability	5,048,129	5,006,167
Liabilities under derivative contracts	276,933	523,150
Right-of-use operating lease liability	237,226	257,424
Long-term debt, net of current maturities	25,629,447	25,476,629
Total liabilities	34,085,936	34,554,036
Redeemable equity	0	25,763
Limited Liability Company (LLC) Members' Equity [Abstract]
Accumulated other comprehensive income	6,497	3,646
Noncontrolling interests	(51,114)	(62,109)
Total liabilities and member's deficiency	33,215,034	33,376,660
CSC Holdings
Current Assets:
Cash and cash equivalents	193,154	277,938
Restricted cash	264	264
Accounts receivable, trade (less allowance for doubtful accounts of $27,931 and $25,198)	406,952	442,581
Prepaid expenses and other current assets ($3,776 and $4,262 due from affiliates)	186,707	255,299
Total current assets	787,077	976,082
Property, plant and equipment, net of accumulated depreciation of $7,142,852 and $6,431,843	6,340,467	5,805,996
Right-of-use operating lease assets	222,124	241,342
Investment securities pledged as collateral	2,161,937	2,250,854
Other assets	76,653	92,203
Amortizable intangibles, net of accumulated amortization of $5,051,149 and $4,409,312	2,202,001	2,781,116
Indefinite-lived cable television franchises	13,216,355	13,068,017
Goodwill	8,205,863	8,160,566
Total assets	33,212,477	33,376,176
Current Liabilities:
Accounts payable	1,023,045	795,576
Interest payable	244,934	252,060
Accrued employee related costs	124,941	142,116
Deferred revenue	94,943	109,798
Debt	917,313	1,245,713
Other current liabilities ($31,810 and $8,538 due to affiliates)	329,944	552,372
Total current liabilities	2,735,120	3,097,635
Other liabilities	159,082	192,563
Deferred tax liability	5,067,442	5,033,980
Liabilities under derivative contracts	276,933	523,150
Right-of-use operating lease liability	237,226	257,424
Long-term debt, net of current maturities	25,629,447	25,476,629
Total liabilities	34,105,250	34,581,381
Redeemable equity	0	25,763
Limited Liability Company (LLC) Members' Equity [Abstract]
Member's deficiency (100 membership units issued and outstanding)	(848,156)	(1,172,505)
Accumulated other comprehensive income	6,497	3,646
Total member's deficiency	(841,659)	(1,168,859)
Noncontrolling interests	(51,114)	(62,109)
Total deficiency	(892,773)	(1,230,968)
Total liabilities and member's deficiency	33,212,477	33,376,176
CSC Holdings | Customer Relationships [Member]
Current Assets:
Amortizable intangibles, net of accumulated amortization of $5,051,149 and $4,409,312	2,093,387	2,573,856
CSC Holdings | Other Intangible Assets [Member]
Current Assets:
Amortizable intangibles, net of accumulated amortization of $5,051,149 and $4,409,312	$ 16,094	$ 20,366