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DEBT - Credit Silo Combination (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2025
Dec. 31, 2024
Debt Instrument [Line Items]      
Principal amount $ 25,317,937,000 $ 25,317,937,000 $ 25,096,412,000
Face Amount of Senior Notes 6,125,000,000 6,125,000,000 6,125,000,000
Carrying amount of Senior Notes 6,171,012,000 6,171,012,000 6,174,932,000
Face Amount of Senior Guaranteed Notes 10,710,000,000 10,710,000,000 10,710,000,000
Carrying amount of Senior Guaranteed Notes 10,677,246,000 10,677,246,000 10,673,478,000
Face amount of Credit Facility Debt 6,874,398,000 6,874,398,000 6,524,408,000
Carrying value of Credit Facility Debt 6,840,425,000 6,840,425,000 6,483,882,000
Finance Lease, Liability 70,985,000 70,985,000 145,362,000
Long-term debt 25,287,151,000 25,287,151,000 25,057,488,000
Finance Lease, Liability, Current 15,400,000 15,400,000 77,770,000
Debt 72,162,000 72,162,000 185,473,000
Long-term debt, net of current maturities 25,214,989,000 25,214,989,000 24,872,015,000
Loans Payable      
Debt Instrument [Line Items]      
Long-term debt 0 0 50,642,000
Credit facility      
Debt Instrument [Line Items]      
Principal amount 56,762,000 56,762,000 57,061,000
Debt     57,061,000
Short-term Debt      
Debt Instrument [Line Items]      
Principal amount 72,162,000 72,162,000 185,473,000
Debt 72,162,000 72,162,000 185,473,000
Cablevision Lightpath      
Debt Instrument [Line Items]      
Face Amount of Senior Notes and Senior Secured Notes 1,537,554,000 1,537,554,000 1,541,000,000
Carrying amount of Senior Notes and Senior Secured Notes 1,527,483,000 1,527,483,000 1,529,192,000
Loans Payable      
Debt Instrument [Line Items]      
Principal amount 0 0 50,642,000
Revolving Credit Facility | CSC Holdings Revolving Credit Facility      
Debt Instrument [Line Items]      
Principal amount $ 2,075,000,000 $ 2,075,000,000 1,700,000,000
Stated interest rate 6.662% 6.662%  
Credit facility $ 2,073,026,000 $ 2,073,026,000 1,697,559,000
Letters of credit outstanding 161,552,000 161,552,000  
Line of credit facility, remaining borrowing capacity 238,448,000 238,448,000  
Line of Credit Facility, Maximum Borrowing Capacity 2,475,000 2,475,000  
Revolving Credit Facility | Cablevision Lightpath Revolving Credit Facility      
Debt Instrument [Line Items]      
Principal amount 0 0 0
Credit facility 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] | Incremental Term Loan B-5      
Debt Instrument [Line Items]      
Principal amount $ 2,842,500,000 $ 2,842,500,000 2,857,500,000
Stated interest rate 9.00% 9.00%  
Credit facility $ 2,836,150,000 $ 2,836,150,000 2,849,460,000
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%  
Secured Debt [Member] | Incremental Term Loan B-6      
Debt Instrument [Line Items]      
Principal amount $ 1,956,898,000 $ 1,956,898,000 1,966,908,000
Stated interest rate 8.812% 8.812%  
Credit facility $ 1,931,249,000 $ 1,931,249,000 1,936,863,000
Line of credit facility, periodic payment amount 5,005,000    
Secured Debt [Member] | Incremental Term Loan B-6 | Synthetic LIBOR      
Debt Instrument [Line Items]      
Basis spread on variable rate   4.50%  
Secured Debt [Member] | Cablevision Lightpath Term B Loan      
Debt Instrument [Line Items]      
Principal amount $ 672,554,000 $ 672,554,000 676,000,000
Stated interest rate 7.312% 7.312%  
Credit facility $ 670,094,000 $ 670,094,000 673,107,000
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 | Fed Rate, Prime Rate and Alternate Base Rate      
Debt Instrument [Line Items]      
Basis spread on variable rate   50.00%  
Secured Debt [Member] | Cablevision Lightpath Term B Loan | Secured Overnight Financing Rate (SOFR)      
Debt Instrument [Line Items]      
Basis spread on variable rate   3.25%  
Cablevision Lightpath Revolving Credit Facility | Cablevision Lightpath Revolving Credit Facility      
Debt Instrument [Line Items]      
Letters of credit outstanding 2,188,000 $ 2,188,000  
Line of credit facility, remaining borrowing capacity 112,812,000 112,812,000  
Line of Credit Facility, Maximum Borrowing Capacity $ 115,000 $ 115,000  
Senior Notes | Cablevision 7.500% Notes due April 1, 2028      
Debt Instrument [Line Items]      
Stated interest rate 7.50% 7.50%  
Principal amount $ 4,118,000 $ 4,118,000 4,118,000
Outstanding debt $ 4,115,000 $ 4,115,000 4,115,000
Senior Notes | CSC Holdings 7.500% Notes due April 1, 2028      
Debt Instrument [Line Items]      
Stated interest rate 7.50% 7.50%  
Principal amount $ 1,045,882,000 $ 1,045,882,000 1,045,882,000
Outstanding debt $ 1,045,235,000 $ 1,045,235,000 1,045,130,000
Senior Notes | CSC Holdings 5.750% Notes due January 15, 2030      
Debt Instrument [Line Items]      
Stated interest rate 5.75% 5.75%  
Principal amount $ 2,250,000,000 $ 2,250,000,000 2,250,000,000
Outstanding debt $ 2,270,215,000 $ 2,270,215,000 2,272,150,000
Senior Notes | CSC Holdings 4.625% Notes due December 1, 2030      
Debt Instrument [Line Items]      
Stated interest rate 4.625% 4.625%  
Principal amount $ 2,325,000,000 $ 2,325,000,000 2,325,000,000
Outstanding debt $ 2,352,685,000 $ 2,352,685,000 2,354,856,000
Senior Notes | CSC Holdings 5.000% Notes due November 15, 2031      
Debt Instrument [Line Items]      
Stated interest rate 5.00% 5.00%  
Principal amount $ 500,000,000 $ 500,000,000 500,000,000
Outstanding debt $ 498,762,000 $ 498,762,000 498,681,000
Senior Notes | Cablevision Lightpath LLC 5.625% Notes due September 15, 2028      
Debt Instrument [Line Items]      
Stated interest rate 5.625% 5.625%  
Principal amount $ 415,000,000 $ 415,000,000 415,000,000
Outstanding debt $ 410,825,000 $ 410,825,000 410,249,000
Secured Debt [Member] | 5.5% Notes due April 15, 2027      
Debt Instrument [Line Items]      
Stated interest rate 5.50% 5.50%  
Principal amount $ 1,310,000,000 $ 1,310,000,000 1,310,000,000
Secured Debt [Member] | 5.375% Senior Guaranteed Notes Due February 1, 2028      
Debt Instrument [Line Items]      
Stated interest rate 5.375% 5.375%  
Principal amount $ 1,000,000,000 $ 1,000,000,000 1,000,000,000
Secured Debt [Member] | CSC Holdings 6.500% Notes due February 1, 2029      
Debt Instrument [Line Items]      
Stated interest rate 6.50% 6.50%  
Principal amount $ 1,750,000,000 $ 1,750,000,000 1,750,000,000
Secured Debt [Member] | CSC Holdings 4.125% Notes due December 1, 2030      
Debt Instrument [Line Items]      
Stated interest rate 4.125% 4.125%  
Principal amount $ 1,100,000,000 $ 1,100,000,000 1,100,000,000
Secured Debt [Member] | 8.0% Notes due April 15, 2020      
Debt Instrument [Line Items]      
Stated interest rate 3.375% 3.375%  
Principal amount $ 1,000,000,000 $ 1,000,000,000 1,000,000,000
Secured Debt [Member] | CSC Holdings 4.500% Senior Guaranteed Notes due November 15, 2021      
Debt Instrument [Line Items]      
Stated interest rate 4.50% 4.50%  
Principal amount $ 1,500,000,000 $ 1,500,000,000 1,500,000,000
Secured Debt [Member] | CSC Holdings 11.2500% Senior Guaranteed Notes due May 15, 2028      
Debt Instrument [Line Items]      
Stated interest rate 11.25% 11.25%  
Principal amount $ 1,000,000,000 $ 1,000,000,000 1,000,000,000
Secured Debt [Member] | CSC Holdings 11.7400% Senior Guaranteed Notes due Jan 31, 2029      
Debt Instrument [Line Items]      
Stated interest rate 11.75% 11.75%  
Principal amount $ 2,050,000,000 $ 2,050,000,000  
Secured Debt [Member] | Cablevision Lightpath LLC 3.875% Notes due September 15, 2027      
Debt Instrument [Line Items]      
Stated interest rate 3.875% 3.875%  
Principal amount $ 450,000,000 $ 450,000,000 450,000,000
Outstanding debt 446,564,000 446,564,000 445,836,000
Senior Subordinated Notes | 5.5% Notes due April 15, 2027      
Debt Instrument [Line Items]      
Outstanding debt 1,308,701,000 1,308,701,000 1,308,363,000
Senior Subordinated Notes | 5.375% Senior Guaranteed Notes Due February 1, 2028      
Debt Instrument [Line Items]      
Outstanding debt 997,323,000 997,323,000 996,853,000
Senior Subordinated Notes | CSC Holdings 6.500% Notes due February 1, 2029      
Debt Instrument [Line Items]      
Outstanding debt 1,748,592,000 1,748,592,000 1,748,423,000
Senior Subordinated Notes | CSC Holdings 4.125% Notes due December 1, 2030      
Debt Instrument [Line Items]      
Outstanding debt 1,097,166,000 1,097,166,000 1,096,940,000
Senior Subordinated Notes | 8.0% Notes due April 15, 2020      
Debt Instrument [Line Items]      
Outstanding debt 998,021,000 998,021,000 997,864,000
Senior Subordinated Notes | CSC Holdings 4.500% Senior Guaranteed Notes due November 15, 2021      
Debt Instrument [Line Items]      
Outstanding debt 1,496,319,000 1,496,319,000 1,496,075,000
Senior Subordinated Notes | CSC Holdings 11.2500% Senior Guaranteed Notes due May 15, 2028      
Debt Instrument [Line Items]      
Outstanding debt 995,768,000 995,768,000 995,174,000
Senior Subordinated Notes | CSC Holdings 11.7400% Senior Guaranteed Notes due Jan 31, 2029      
Debt Instrument [Line Items]      
Outstanding debt 2,035,356,000 2,035,356,000  
Long-term Debt      
Debt Instrument [Line Items]      
Principal amount 25,245,775,000 25,245,775,000 24,910,939,000
Long-term debt, net of current maturities $ 25,214,989,000 $ 25,214,989,000 $ 24,872,015,000