CSC HOLDINGS - CONSOLIDATED STATEMENT OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Net Cash Provided by (Used in) Operating Activities [Abstract]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ (78,277)	$ 79,037	$ 220,889
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	1,642,231	1,644,297	1,773,673
Loss (gain) on investments and sale of affiliate interests, net	(670)	(180,237)	659,792
Loss (gain) on derivative contracts, net	0	166,489	(425,815)
Loss (gain) on extinguishment of debt and write-off of deferred financing costs	12,901	(4,393)	575
Amortization of deferred financing costs and discounts (premiums) on indebtedness	19,628	34,440	77,356
Share-based compensation expense	67,162	47,926	159,985
Deferred income taxes	(396,052)	(226,915)	36,385
Decrease in right-of-use assets	44,632	46,108	44,342
Allowance for credit losses	86,561	84,461	88,159
Goodwill, Impairment Loss	0	163,055	0
Other Operating Activities, Cash Flow Statement	6,436	11,169	3,460
Increase (Decrease) in Operating Capital [Abstract]
Accounts receivable, trade	(58,917)	(77,703)	(45,279)
Prepaid expenses and other assets	30,205	(54,782)	50,419
Amounts due from and due to affiliates	(44,486)	50,831	(7,749)
Accounts payable and accrued liabilities	3,880	(68,784)	39,307
Increase (Decrease) in Interest Payable, Net	131,701	29,528	7,417
Deferred revenue	11,018	9,164	(14,953)
Interest rate swap contracts	104,448	72,707	(301,062)
Net Cash Provided by (Used in) Operating Activities, Total	1,582,401	1,826,398	2,366,901
Net Cash Provided by (Used in) Investing Activities [Abstract]
Capital expenditures	(1,433,013)	(1,704,811)	(1,914,282)
Payments for acquisitions, net of cash acquired	(38,532)	0	(2,060)
Payments for (Proceeds from) Other Investing Activities	16,032	(1,712)	(5,168)
Net Cash Provided by (Used in) Investing Activities, Total	(1,455,513)	(1,706,523)	(1,921,510)
Net Cash Provided by (Used in) Financing Activities [Abstract]
Proceeds from long-term debt	4,214,750	2,700,000	4,276,903
Repayments of Debt	(4,223,233)	(2,688,009)	(4,469,727)
Proceeds from derivative contracts in connection with the settlement of collateralized debt	0	38,902	0
Principal payments on finance lease obligations	(127,349)	(149,297)	(134,682)
Payments related to acquisition of noncontrolling interest	(7,261)	(14,070)	0
Payments of Financing Costs	(19,560)	(7,247)	(1,829)
Other, net	(9,325)	(2,870)	(6,571)
Net cash used in financing activities	(171,978)	(122,591)	(335,906)
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect, Total	(45,090)	(2,716)	109,485
Effect of exchange rate changes on cash and cash equivalents	(424)	(697)	291
Net increase (decrease) in cash and cash equivalents	(45,514)	(3,413)	109,776
Cash, cash equivalents and restricted cash at beginning of year	302,338	305,751	195,975
Cash, cash equivalents and restricted cash at end of year	256,824	302,338	305,751
CSC Holdings
Net Cash Provided by (Used in) Operating Activities [Abstract]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	(77,420)	75,988	224,577
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	1,642,231	1,644,297	1,773,673
Loss (gain) on investments and sale of affiliate interests, net	(670)	(180,237)	659,792
Loss (gain) on derivative contracts, net	0	166,489	(425,815)
Loss (gain) on extinguishment of debt and write-off of deferred financing costs	12,901	(4,393)	575
Amortization of deferred financing costs and discounts (premiums) on indebtedness	19,628	34,440	77,356
Share-based compensation expense	67,162	47,926	159,985
Deferred income taxes	(399,551)	(232,048)	25,705
Decrease in right-of-use assets	44,632	46,108	44,342
Allowance for credit losses	86,561	84,461	88,159
Goodwill, Impairment Loss	0	163,055	0
Other Operating Activities, Cash Flow Statement	6,436	11,169	3,460
Increase (Decrease) in Operating Capital [Abstract]
Accounts receivable, trade	(58,917)	(77,703)	(45,279)
Prepaid expenses and other assets	15,547	(54,782)	50,419
Amounts due from and due to affiliates	(45,141)	59,013	(756)
Accounts payable and accrued liabilities	(78,792)	(68,784)	39,306
Increase (Decrease) in Interest Payable, Net	131,701	29,528	7,417
Deferred revenue	11,018	9,164	(14,953)
Interest rate swap contracts	104,448	72,707	(301,062)
Net Cash Provided by (Used in) Operating Activities, Total	1,481,774	1,826,398	2,366,901
Net Cash Provided by (Used in) Investing Activities [Abstract]
Capital expenditures	(1,433,013)	(1,704,811)	(1,914,282)
Payments for acquisitions, net of cash acquired	(38,532)	0	(2,060)
Payments for (Proceeds from) Other Investing Activities	16,032	(1,712)	(5,168)
Net Cash Provided by (Used in) Investing Activities, Total	(1,455,513)	(1,706,523)	(1,921,510)
Net Cash Provided by (Used in) Financing Activities [Abstract]
Proceeds from long-term debt	4,214,750	2,700,000	4,276,903
Repayments of Debt	(4,225,233)	(2,688,009)	(4,469,727)
Proceeds from Related Party Debt	92,500	0	0
Proceeds from derivative contracts in connection with the settlement of collateralized debt	0	38,902	0
Distributions to parent	8,399	1,793	170
Principal payments on finance lease obligations	(127,349)	(149,297)	(134,682)
Payments related to acquisition of noncontrolling interest	(7,261)	(14,070)	0
Payments of Financing Costs	(19,560)	(7,247)	(1,829)
Other, net	(1,000)	(1,077)	(3,851)
Net cash used in financing activities	(81,552)	(122,591)	(333,356)
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect, Total	(55,291)	(2,716)	112,035
Effect of exchange rate changes on cash and cash equivalents	(424)	(697)	291
Net increase (decrease) in cash and cash equivalents	(55,715)	(3,413)	112,326
Cash, cash equivalents and restricted cash at beginning of year	302,331	305,744	193,418
Cash, cash equivalents and restricted cash at end of year	$ 246,616	$ 302,331	$ 305,744