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DEBT - Credit Facilities Outstanding (Details) - USD ($)
Mar. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Long-term debt $ 24,447,335,000 $ 24,420,285,000
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  
Credit facility, Carrying Value 0 0
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 2.86%  
Credit facility, Carrying Value $ 2,904,808,000 2,911,729,000
Incremental Term Loan B-3 | Secured Debt [Member]    
Debt Instrument [Line Items]    
Stated interest rate 2.86%  
Credit facility, Carrying Value $ 1,257,221,000 1,260,200,000
Secured Debt [Member]    
Debt Instrument [Line Items]    
Long-term debt $ 1,593,073,000 $ 1,585,088,000