v3.26.1
DEBT - Senior Guaranteed Notes, Senior Secured Notes, and Senior Notes and Debentures (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Debt Instrument [Line Items]    
Principal Amount $ 26,741,669 $ 26,407,393
Long-Term Debt, Current Maturities (4,147,837) (60,842)
Long-Term Debt (26,550,765) (26,206,214)
Loans Payable    
Debt Instrument [Line Items]    
Long-Term Debt, Current Maturities (4,147,837)  
Long-Term Debt (4,151,284) (60,842)
Incremental Term Loan B-5 | Secured Debt [Member]    
Debt Instrument [Line Items]    
Principal Amount 2,812,500 2,827,500
Credit facility $ 2,809,643 2,822,895
Stated interest rate 8.25%  
Unsub Group Credit Facility | Secured Debt [Member]    
Debt Instrument [Line Items]    
Principal Amount   2,000,000
Credit facility $ 2,923,712 1,898,893
Stated interest rate 9.00%  
Unsub Group Credit Facility | Senior Subordinated Notes    
Debt Instrument [Line Items]    
Principal Amount $ 3,100,000  
NYC ABS Receivable facility loan | Secured Debt [Member]    
Debt Instrument [Line Items]    
Principal Amount 980,091  
Credit facility 881,175  
Cablevision Lightpath LLC 3.875% Notes due September 15, 2027 | Secured Debt [Member]    
Debt Instrument [Line Items]    
Principal Amount $ 0 450,000
Lightpath Fiber Issuer LLC Series 2026-1, Class A-2 5.597% Notes due 2031 | Secured Debt [Member]    
Debt Instrument [Line Items]    
Stated interest rate 5.597%  
Lightpath Fiber Issuer LLC Series 2026-1, Class A-2 5.597% Notes due 2031 | Secured Debt [Member]    
Debt Instrument [Line Items]    
Principal Amount $ 1,527,000  
Credit facility $ 1,504,956  
Lightpath Fiber Issuer LLC Series 2026-1, Class B 5.597% Notes due 2031 | Secured Debt [Member]    
Debt Instrument [Line Items]    
Stated interest rate 5.89%  
Lightpath Fiber Issuer LLC Series 2026-1, Class B 5.597% Notes due 2031 | Secured Debt [Member]    
Debt Instrument [Line Items]    
Principal Amount $ 130,000  
Credit facility 128,123  
Secured Fiber Network Revenue Notes | Secured Debt [Member]    
Debt Instrument [Line Items]    
Principal Amount 1,657,000  
Credit facility 1,633,079  
Lightpath Variable Funding Notes    
Debt Instrument [Line Items]    
Letters of credit outstanding 6,288  
Line of Credit Facility, Maximum Borrowing Capacity 100,000  
Line of credit facility, remaining borrowing capacity 93,712  
CSC Holdings Revolving Credit Facility | Revolving Credit Facility    
Debt Instrument [Line Items]    
Principal Amount 2,225,000 2,125,000
Credit facility $ 2,223,984 $ 2,123,506
Stated interest rate 5.975%  
Letters of credit outstanding $ 174,799  
Line of Credit Facility, Maximum Borrowing Capacity 2,475  
Line of credit facility, remaining borrowing capacity $ 75,201