DEBT - Narrative (Details) - USD ($)	3 Months Ended	6 Months Ended
	Jun. 30, 2025	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Debt Instrument [Line Items]
Proceeds from long-term debt		$ 675,000,000	$ 3,775,000,000
Repayments of line of credit		404,839,000	$ 3,635,449,000
Principal Amount	$ 25,317,937,000	25,317,937,000		$ 25,096,412,000
2027 Revolving Credit Commitments
Debt Instrument [Line Items]
Line of credit facility, periodic payment amount		95,000
2025 Revolving Credit Commitments
Debt Instrument [Line Items]
Line of credit facility, periodic payment amount		20,000
CSC Holdings 11.7400% Senior Guaranteed Notes due Jan 31, 2029 | Secured Debt [Member]
Debt Instrument [Line Items]
Principal Amount	$ 2,050,000,000	$ 2,050,000,000
Stated interest rate	11.75%	11.75%
Revolving Credit Facility | CSC Holdings Revolving Credit Facility
Debt Instrument [Line Items]
Proceeds from long-term debt		$ 675,000
Repayments of line of credit		300,000
Principal Amount	$ 2,075,000,000	2,075,000,000		1,700,000,000
Line of Credit Facility, Maximum Borrowing Capacity	2,475,000	2,475,000
Letters of credit outstanding	161,552,000	161,552,000
Revolving Credit Facility | Cablevision Lightpath Revolving Credit Facility
Debt Instrument [Line Items]
Principal Amount	0	$ 0		0
Secured Debt [Member] | Synthetic LIBOR Rate (one month)
Debt Instrument [Line Items]
Basis spread on variable rate		0.11448%
Secured Debt [Member] | Synthetic LIBOR Rate (three months)
Debt Instrument [Line Items]
Basis spread on variable rate		0.26161%
Secured Debt [Member] | Synthetic LIBOR Rate (six months)
Debt Instrument [Line Items]
Basis spread on variable rate		0.42826%
Secured Debt [Member] | Cablevision Lightpath Term B Loan
Debt Instrument [Line Items]
Principal Amount	672,554,000	$ 672,554,000		676,000,000
Debt Instrument, Issued, Principal		$ 676,000
Secured Debt [Member] | Cablevision Lightpath Term B Loan | Alternate base Rate
Debt Instrument [Line Items]
Basis spread on variable rate		2.25%
Secured Debt [Member] | Cablevision Lightpath Term B Loan | Secured Overnight Financing Rate (SOFR)
Debt Instrument [Line Items]
Basis spread on variable rate		3.25%
Secured Debt [Member] | Cablevision Lightpath Term B Loan Refinancing Amendment | Alternate base Rate
Debt Instrument [Line Items]
Basis spread on variable rate		2.00%
Secured Debt [Member] | Cablevision Lightpath Term B Loan Refinancing Amendment | Secured Overnight Financing Rate (SOFR)
Debt Instrument [Line Items]
Basis spread on variable rate		3.00%
Secured Debt [Member] | Incremental Term Loan B-5
Debt Instrument [Line Items]
Principal Amount	2,842,500,000	$ 2,842,500,000		$ 2,857,500,000
Line of credit facility, periodic payment amount	7,500,000
Secured Debt [Member] | Incremental Term Loan B-5 | Alternate base Rate
Debt Instrument [Line Items]
Basis spread on variable rate		1.50%
Secured Debt [Member] | Incremental Term Loan B-5 | Synthetic LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate		2.50%
Cablevision Lightpath Revolving Credit Facility | Cablevision Lightpath Revolving Credit Facility
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	115,000	$ 115,000
Letters of credit outstanding	$ 2,188,000	$ 2,188,000