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DEBT - Credit Facilities Outstanding (Details) - USD ($)
Dec. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jan. 31, 2018
Mar. 15, 2017
Jun. 21, 2016
Debt Instrument [Line Items]            
Long-term debt $ 24,420,285,000 $ 22,812,600,000        
CSC Holdings Revolving Credit Facility, Portion Due October 9, 2020 | Revolving Credit Facility            
Debt Instrument [Line Items]            
Line of Credit Facility, Maximum Borrowing Capacity   200,000        
CSC Holdings Revolving Credit Facility | Revolving Credit Facility            
Debt Instrument [Line Items]            
Line of Credit Facility, Maximum Borrowing Capacity 2,275,000,000         $ 2,475,000,000
Credit facility, Carrying Value 0 231,425,000        
Letters of credit outstanding 178,014,000          
Line of credit facility, remaining borrowing capacity $ 2,296,986,000          
CSC Holdings Term Loan B | Secured Debt [Member]            
Debt Instrument [Line Items]            
Stated interest rate 3.99%          
Credit facility, Carrying Value $ 2,911,729,000 2,939,425,000        
Incremental Term Loan B-2 | Secured Debt [Member]            
Debt Instrument [Line Items]            
Stated interest rate 0.00%          
Line of Credit Facility, Maximum Borrowing Capacity       $ 1,500,000,000    
Credit facility, Carrying Value $ 0 1,475,778,000        
Incremental Term Loan B-3 | Secured Debt [Member]            
Debt Instrument [Line Items]            
Stated interest rate 3.99%          
Line of Credit Facility, Maximum Borrowing Capacity   1,275,000,000        
Credit facility, Carrying Value $ 1,260,200,000 1,268,931,000        
Cequel Term Loan Facility | Secured Debt [Member]            
Debt Instrument [Line Items]            
Line of Credit Facility, Maximum Borrowing Capacity     $ 1,265,000,000      
Credit facility, Carrying Value         $ 812,963,000  
Secured Debt [Member]            
Debt Instrument [Line Items]            
Long-term debt $ 1,585,088,000 $ 1,406,182,000