INTERIM FINANCIAL INFORMATION (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Quarterly Financial Information [Line Items]
Revenues	$ 10,090,849	$ 9,894,642	$ 9,760,859
Operating expenses	(7,566,222)	(7,779,353)	(7,937,048)
Operating Income (Loss), Total	2,524,627	2,115,289	1,823,811
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	1,010,932	443,479	139,939
Net income attributable to noncontrolling interests	(20,621)	(7,296)	(1,003)
Net income attributable to Altice USA, Inc. stockholders	990,311	436,183	138,936
Impact from changes in tax rates	(6,924)	(46,768)	1,046
Operating Income (Loss)	2,524,627	2,115,289	1,823,811
Net Income (Loss) Attributable to Noncontrolling Interest	20,621	7,296	1,003
Net income attributable to CSC Holdings, LLC sole member	990,311	436,183	138,936
Changes in the state rates used to measure deferred taxes, net of federal impact	$ (6,924)	$ (46,768)	$ 1,046
Basic income per share	$ 2.16	$ 0.75	$ 0.21
Diluted income per share	$ 2.14	$ 0.75	$ 0.21
CSC Holdings
Quarterly Financial Information [Line Items]
Revenues	$ 10,090,849	$ 9,894,642	$ 9,760,859
Operating expenses	(7,566,222)	(7,779,353)	(7,937,048)
Operating Income (Loss), Total	2,524,627	2,115,289	1,823,811
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	1,008,797	455,838	212,817
Net income attributable to noncontrolling interests	(20,621)	(7,296)	(1,003)
Net income attributable to Altice USA, Inc. stockholders	988,176	448,542	211,814
Impact from changes in tax rates	(7,125)	(46,768)	(6,532)
Distributions to parent	763,435	4,794,408	2,279,472
Operating Income (Loss)	2,524,627	2,115,289	1,823,811
Net Income (Loss) Attributable to Noncontrolling Interest	20,621	7,296	1,003
Net income attributable to CSC Holdings, LLC sole member	988,176	448,542	211,814
Changes in the state rates used to measure deferred taxes, net of federal impact	(7,125)	(46,768)	(6,532)
Pay TV [Member]
Quarterly Financial Information [Line Items]
Revenues	3,526,205	3,670,859	3,997,873
Broadband [Member]
Quarterly Financial Information [Line Items]
Revenues	3,925,089	3,689,159	3,222,605
Telephony [Member]
Quarterly Financial Information [Line Items]
Revenues	404,813	468,777	598,694
Business Services and Wholesale [Member]
Quarterly Financial Information [Line Items]
Revenues	1,586,044	1,454,532	1,428,532
Mobile [Member]
Quarterly Financial Information [Line Items]
Revenues	84,194	78,127	21,264
Advertising and News [Member]
Quarterly Financial Information [Line Items]
Revenues	$ 550,667	$ 519,205	$ 475,904