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DEBT - Credit Facilities Outstanding (Details) - USD ($)
Mar. 31, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Long-term debt $ 26,689,536,000 $ 26,722,342,000
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]    
Stated interest rate 2.358%  
Line of Credit Facility, Maximum Borrowing Capacity $ 2,475,000,000  
Credit facility, Carrying Value 566,720,000 616,027,000
Letters of credit outstanding 137,875,000  
Line of credit facility, remaining borrowing capacity $ 1,762,125,000  
CSC Holdings Term Loan B | Secured Debt [Member]    
Debt Instrument [Line Items]    
Stated interest rate 2.356%  
Credit facility, Carrying Value $ 2,877,145,000 2,884,065,000
Incremental Term Loan B-3 | Secured Debt [Member]    
Debt Instrument [Line Items]    
Stated interest rate 2.356%  
Credit facility, Carrying Value $ 1,245,315,000 1,248,293,000
Secured Debt [Member]    
Debt Instrument [Line Items]    
Long-term debt $ 1,677,985,000 $ 1,617,506,000