Restricted Group Condensed Income Statement (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Condensed Income Statements, Captions [Line Items]
Revenues	$ 8,954,417	$ 9,237,064	$ 9,647,659
Operating Income (Loss)	1,680,092	1,701,940	1,802,594
Total other income (expense)	(1,762,440)	(1,583,375)	(1,285,865)
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	(82,348)	118,565	516,729
Income tax benefit (expense)	4,071	(39,528)	(295,840)
Net income (loss)	(78,277)	79,037	220,889
Comprehensive income attributable to noncontrolling interests	(24,641)	(25,839)	(26,326)
Net income (loss) attributable to CSC Holdings, LLC sole member	(102,918)	53,198	194,563
CSC Holdings
Condensed Income Statements, Captions [Line Items]
Revenues	8,954,417	9,237,064	9,647,659
Operating Expenses	7,276,139	7,535,124
Operating Income (Loss)	1,678,278	1,701,940	1,802,594
Total other income (expense)	(1,763,970)	(1,583,375)	(1,285,865)
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	(85,692)	118,565	516,729
Income tax benefit (expense)	8,272	(42,577)	(292,152)
Net income (loss)	(77,420)	75,988	224,577
Comprehensive income attributable to noncontrolling interests	(24,641)	(25,839)	(26,326)
Net income (loss) attributable to CSC Holdings, LLC sole member	(102,061)	50,149	$ 198,251
CSC Holdings Restricted Group
Condensed Income Statements, Captions [Line Items]
Revenues	8,487,850	8,798,456
Operating Expenses	6,949,953	7,241,754
Operating Income (Loss)	1,537,897	1,556,702
Total other income (expense)	(1,670,535)	(1,527,298)
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	(132,638)	29,404
Income tax benefit (expense)	21,464	(22,216)
Net income (loss)	(111,174)	7,188
Comprehensive income attributable to noncontrolling interests	0	(1,881)
Net income (loss) attributable to CSC Holdings, LLC sole member	(111,174)	5,307
Unrestricted Group
Condensed Income Statements, Captions [Line Items]
Revenues	474,819	445,742
Operating Expenses	334,482	300,504
Operating Income (Loss)	140,337	145,238
Total other income (expense)	(89,315)	(53,008)
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	51,022	92,230
Income tax benefit (expense)	(13,192)	(20,361)
Net income (loss)	37,830	71,869
Comprehensive income attributable to noncontrolling interests	(27,056)	(27,027)
Net income (loss) attributable to CSC Holdings, LLC sole member	10,774	44,842
Consolidation, Eliminations
Condensed Income Statements, Captions [Line Items]
Revenues	(8,252)	(7,134)
Operating Expenses	(8,296)	(7,134)
Operating Income (Loss)	44	0
Total other income (expense)	(4,120)	(3,069)
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	(4,076)	(3,069)
Income tax benefit (expense)	0	0
Net income (loss)	(4,076)	(3,069)
Comprehensive income attributable to noncontrolling interests	2,415	3,069
Net income (loss) attributable to CSC Holdings, LLC sole member	$ (1,661)	$ 0