CSC HOLDINGS - CONSOLIDATED STATEMENT OF MEMBER'S EQUITY - USD ($) $ in Thousands	Total	CSC Holdings	Retained Earnings	Retained Earnings CSC Holdings	Other Member's Equity	Other Member's Equity CSC Holdings	Accumulated Other Comprehensive Loss	Accumulated Other Comprehensive Loss CSC Holdings	Total Member's Equity	Total Member's Equity CSC Holdings	Noncontrolling Interests	Noncontrolling Interests CSC Holdings
Retained earnings				$ (685,576)
Accumulated other comprehensive loss								$ 1,979
Membership equity before noncontrolling interest										$ 8,858,477
Noncontrolling interest												$ 287
Limited Liability Company (LLC) Members' Equity, Including Portion Attributable to Noncontrolling Interest		$ 8,858,764
Members' Equity						$ 9,542,074
Net Income (Loss) Attributable to Noncontrolling Interest	$ 1,587	1,587									$ 1,587	1,587
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Plan Amendments, Net Of Tax	12,001	12,001					$ 12,001	12,001	$ 12,001	12,001
Proceeds from Contributions from Parent		761,316				761,316				(761,316)
Adjustments to Additional Paid in Capital, Increase in Carrying Amount of Redeemable Preferred Stock	163,142	163,141			$ 163,142	163,141			163,142	163,141
Cash distributions to shareholders	840,035	2,777,498			839,700	2,777,498			839,700	2,777,498	335
Recognition of previously unrealized excess tax benefits related to share-based awards in connection with the adoption of ASU 2016-09	310,771	143,859	$ 310,771	143,859					310,771	143,859
Net income (loss) attributable to members	1,493,177	2,576,289	1,493,177	2,576,289					1,493,177	2,576,289
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	57,430	57,430			57,430	57,430			57,430	57,430
Foreign currency translation adjustment, net of income taxes	0	0
Noncash contribution from parent	0
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders		335										335
Retained earnings				2,034,572
Accumulated other comprehensive loss								(10,022)
Membership equity before noncontrolling interest										9,444,731
Noncontrolling interest		1,539										1,539
Limited Liability Company (LLC) Members' Equity, Including Portion Attributable to Noncontrolling Interest		9,446,270
Members' Equity						7,420,181
Net Income (Loss) Attributable to Noncontrolling Interest	1,761	1,761									1,761	1,761
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Plan Amendments, Net Of Tax	(1,536)	1,536					(1,536)	1,536	(1,536)	1,536
Redeemable equity vested	169,452	169,452			169,452	169,452			169,452	169,452
Proceeds from Contributions from Parent		50,000				50,000				(50,000)
Adjustments to Additional Paid in Capital, Increase in Carrying Amount of Redeemable Preferred Stock	68,169	68,169			68,169	68,169			68,169	68,169
Cash distributions to shareholders	1,499,935	3,058,747		1,672,031		1,386,716				3,058,747
Net income (loss) attributable to members	18,833	258,565	18,833	258,565					18,833	258,565
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	59,812	59,812			59,812	59,812			59,812	59,812
Foreign currency translation adjustment, net of income taxes	706	706					706	706	706	706
Impact of i24 Acquisition	(13,649)	(13,649)	(73,578)	(73,578)	61,769	61,769	(1,840)	(1,840)	(13,649)	(13,649)
Debt exchanged to subsidiary		(2,854,392)				(2,854,392)				(2,854,392)
Distribution Made to Limited Liability Company (LLC) Member, Non-cash Distributions Paid		(3,058,747)
Noncash contribution from parent	0	151,455				151,455				(151,455)
Contributions from noncontrolling interests, net	5,995	5,995									5,995	5,995
Other changes to equity	(859)				(859)				(859)
Retained earnings	251,830	549,691		549,691
Membership interest before accumulated comprehensive loss		4,001,628
Accumulated other comprehensive loss	(11,783)	(11,783)						(11,783)
Membership equity before noncontrolling interest		3,989,845								3,989,845
Noncontrolling interest	9,295	9,295										9,295
Limited Liability Company (LLC) Members' Equity, Including Portion Attributable to Noncontrolling Interest		3,999,140
Cumulative Effect of New Accounting Principle in Period of Adoption | ASU No. 2018-02			$ 2,163	2,163			(2,163)	(2,163)
Members' Equity		3,451,937				3,451,937
Net Income (Loss) Attributable to Noncontrolling Interest	1,003	1,003									1,003	1,003
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Plan Amendments, Net Of Tax	(9,697)	(9,697)					(9,697)	(9,697)	(9,697)	(9,697)
Redeemable equity vested	187,966	187,967			187,966	187,967			187,966	187,967
Adjustments to Additional Paid in Capital, Increase in Carrying Amount of Redeemable Preferred Stock	166,511	166,511			166,511	166,511			166,511	166,511
Net income (loss) attributable to members	138,936	211,814		211,814					138,936	211,814
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	99,077	99,077			99,077	99,077			99,077	99,077
Foreign currency translation adjustment, net of income taxes	(1,164)	(1,164)					$ (1,164)	(1,164)	(1,164)	(1,164)
Impact of i24 Acquisition		10,773			10,768	10,773				10,773
Distribution Made to Limited Liability Company (LLC) Member, Non-cash Distributions Paid		2,279,472		747,990		1,531,482				2,279,472
Noncash contribution from parent	19,697
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	1,000	1,000									$ 1,000	1,000
Debt exchange between parent and subsidiary		(169,334)				(169,334)				(169,334)
Stock Issued During Period, Value, New Issues	7,122				$ 7,099				$ 7,122
Retained earnings	390,766	13,515		$ 13,515
Membership interest before accumulated comprehensive loss		2,047,397
Accumulated other comprehensive loss	(3,250)	(3,250)						$ (3,250)
Membership equity before noncontrolling interest		2,044,147								$ 2,044,147
Noncontrolling interest	$ 9,298	9,298										$ 9,298
Limited Liability Company (LLC) Members' Equity, Including Portion Attributable to Noncontrolling Interest		2,053,445
Members' Equity		$ 2,033,882				$ 2,033,882