v3.25.4
DEBT - Lightpath (Details) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2021
Feb. 10, 2026
Jan. 12, 2026
Dec. 31, 2024
Debt Instrument [Line Items]            
Principal Amount $ 26,407,393,000 $ 26,407,393,000       $ 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        
Cablevision Lightpath Term B Loan            
Debt Instrument [Line Items]            
Senior secured ratio 7.30 7.30        
Senior Debt Covenant, Leverage Ratio 6.75 6.75        
Incurrence Test 4.75 4.75        
Incremental Litchfield Credit Facility Loan | Subsequent Event            
Debt Instrument [Line Items]            
Principal Amount         $ 1,100,000,000  
Lightpath Secured Fiber Network Revenue Notes | Subsequent Event            
Debt Instrument [Line Items]            
Principal Amount       $ 1,657,000,000    
Lightpath Secured Fiber Network Revenue Notes Series 2026-1 Class A-2 Notes | Subsequent Event            
Debt Instrument [Line Items]            
Principal Amount       $ 1,527,000,000    
Stated interest rate       5.597%    
Lightpath Secured Fiber Network Revenue Notes Series 2026-1 Class B Notes | Subsequent Event            
Debt Instrument [Line Items]            
Principal Amount       $ 130,000,000    
Stated interest rate       5.89%    
Litchfield Credit Facility Loan | Subsequent Event            
Debt Instrument [Line Items]            
Principal Amount         $ 2,000,000,000  
Stated interest rate         9.00%  
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 $ 669,183,000 $ 669,183,000 $ 600,000,000     676,000,000
Debt discount rate     99.50%      
Line of credit facility, periodic payment amount $ 1,760,000          
Debt Instrument, Increase (Decrease), Net   $ 100,000,000        
Net price of debt issued 99.27% 99.27%        
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] | Initial Principal Amount of Cablevision Lightpath Term B Loan            
Debt Instrument [Line Items]            
Principal Amount $ 676,000,000 $ 676,000,000        
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%        
Revolving Credit Facility | Cablevision Lightpath Revolving Credit Facility            
Debt Instrument [Line Items]            
Principal Amount 0 $ 0       $ 0
Line of Credit Facility, Maximum Borrowing Capacity $ 115,000 115,000 $ 100,000,000      
Proceeds from long-term debt   40,000        
Repayments of line of credit   40,000        
Line of Credit Facility, Increase (Decrease), Net   $ 15,000        
Debt Securities | Cablevision Lightpath Term B Loan | Secured Overnight Financing Rate (SOFR)            
Debt Instrument [Line Items]            
Basis spread on variable rate   3.25%