CSC HOLDINGS - CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Current Assets:
Cash and cash equivalents	$ 701,898	$ 298,781
Restricted cash	262	257
Accounts receivable, trade (less allowance for doubtful accounts of $13,420 and $11,677)	457,118	448,399
Prepaid expenses and other current assets (including a prepayment to an affiliate of $19,563 in 2017) (See Note 14)	215,304	136,285
Amounts due from affiliates	6,774	17,557
Operating Lease, Right-of-Use Asset	280,340	0
Derivative contracts	0	1,975
Total current assets	1,381,356	903,254
Property, plant and equipment, net	5,753,401	5,828,881
Investment securities pledged as collateral	1,931,697	1,462,626
Derivative contracts	25,207	109,344
Other assets	92,622	84,382
Amortizable intangible assets, net of accumulated amortization	3,481,109	4,192,824
Indefinite-lived cable television franchises	13,020,081	13,020,081
Goodwill	8,142,309	8,012,416
Total assets	34,108,122	33,613,808
Current Liabilities:
Accounts payable	799,618	857,502
Amounts due to affiliates	7,456	26,096
Accrued liabilities:
Interest payable	385,655	386,475
Accrued employee related costs	111,337	139,806
Other Accrued Liabilities, Current	378,954	312,634
Contract with Customer, Liability, Current	124,777	140,053
Long-term Debt, Right-Of-Use Financing Obligations, Current Maturities	269,062
Long-term Debt, Current Maturities	170,682	158,625
Total current liabilities	1,978,479	2,021,191
Long-term defined benefit plan obligations	57,190	96,794
Other liabilities	147,714	174,760
Deferred tax liability	4,762,595	4,723,937
Liabilities under derivative contracts	255,666	132,908
Long-term Debt, Right-Of-Use Financing Obligations, Excluding Current Maturities		0
Long-term Debt, Excluding Current Maturities	24,249,603	22,653,975
Total liabilities	31,720,309	29,803,565
Commitments and contingencies
Redeemable equity	108,551	130,007
Limited Liability Company (LLC) Members' Equity [Abstract]
Retained earnings (accumulated deficit)	390,766	251,830
Accumulated other comprehensive income (loss)	(3,250)	(11,783)
Noncontrolling interest	9,298	9,295
Total liabilities and equity	34,108,122	33,613,808
Customer Relationships [Member]
Current Assets:
Amortizable intangible assets, net of accumulated amortization	3,173,963	3,808,774
Other Intangible Assets [Member]
Current Assets:
Amortizable intangible assets, net of accumulated amortization	24,547	18,965
CSC Holdings
Current Assets:
Cash and cash equivalents	697,741	298,527
Restricted cash	262	257
Accounts receivable, trade (less allowance for doubtful accounts of $13,420 and $11,677)	457,118	448,399
Prepaid expenses and other current assets (including a prepayment to an affiliate of $19,563 in 2017) (See Note 14)	211,642	141,267
Amounts due from affiliates	6,774	4,385
Operating Lease, Right-of-Use Asset	280,340	0
Derivative contracts	0	1,975
Total current assets	1,373,537	894,810
Property, plant and equipment, net	5,753,401	5,828,881
Investment securities pledged as collateral	1,931,697	1,462,626
Derivative contracts	25,207	109,344
Other assets	92,622	65,183
Amortizable intangible assets, net of accumulated amortization	3,481,109	4,192,824
Indefinite-lived cable television franchises	13,020,081	13,020,081
Goodwill	8,142,309	8,012,416
Total assets	34,100,303	33,586,165
Current Liabilities:
Accounts payable	799,618	857,502
Amounts due to affiliates	7,456	179,417
Accrued liabilities:
Interest payable	385,655	366,644
Accrued employee related costs	111,337	139,806
Other Accrued Liabilities, Current	378,948	301,783
Contract with Customer, Liability, Current	124,777	140,053
Long-term Debt, Current Maturities	170,682	158,625
Total current liabilities	1,978,473	2,143,830
Long-term defined benefit plan obligations	57,190	96,794
Other liabilities	147,714	174,757
Deferred tax liability	4,980,599	5,349,947
Liabilities under derivative contracts	255,666	132,908
Long-term Debt, Right-Of-Use Financing Obligations, Excluding Current Maturities	269,062	0
Long-term Debt, Excluding Current Maturities	24,249,603	21,558,782
Total liabilities	31,938,307	29,457,018
Redeemable equity	108,551	130,007
Limited Liability Company (LLC) Members' Equity [Abstract]
Members' Equity	2,033,882	3,451,937
Retained earnings (accumulated deficit)	13,515	549,691
Membership interest before accumulated comprehensive loss	2,047,397	4,001,628
Accumulated other comprehensive income (loss)	(3,250)	(11,783)
Membership equity before noncontrolling interest	2,044,147	3,989,845
Noncontrolling interest	9,298	9,295
Limited Liability Company (LLC) Members' Equity, Including Portion Attributable to Noncontrolling Interest	2,053,445	3,999,140
Total liabilities and equity	$ 34,100,303	$ 33,586,165