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DEBT - Narrative (Details) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
May 31, 2019
Feb. 28, 2019
Jan. 31, 2019
Sep. 30, 2019
Sep. 30, 2019
Sep. 30, 2018
Jul. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]                
Principal amount       $ 24,445,380,000 $ 24,445,380,000     $ 23,296,581,000
Debt borrowed       24,057,281,000 24,057,281,000     22,812,600,000
Repayments of debt         1,342,625,000 $ 635,738,000    
Deferred financing costs $ 1,195,000              
Collateralized indebtedness                
Debt Instrument [Line Items]                
Principal amount       $ 1,459,638,000 $ 1,459,638,000     1,459,638,000
CSC Holdings | Senior Notes | Senior Notes Due January 2030 [Member]                
Debt Instrument [Line Items]                
Principal amount             $ 1,000,000,000  
CSC Holdings | Senior Notes | Senior Guaranteed Notes Due 2029                
Debt Instrument [Line Items]                
Principal amount     $ 1,500,000,000          
Interest rate   101.75% 6.50%          
Additional debt issued   $ 250,000,000            
CSC Holdings | Senior Notes | CSC Holdings 8.625% Notes due February 2019                
Debt Instrument [Line Items]                
Interest rate     8.625%          
Redeemed debt     $ 526,000,000          
CSC Holdings | Senior Notes | CSC Holdings 10.125% Notes due January 2023                
Debt Instrument [Line Items]                
Interest rate   10.125% 10.125%          
Redeemed debt   $ 894,700,000 $ 905,300,000          
Redemption price percent     107.594%          
Short term debt reclassified               526,000,000
CSC Holdings | Collateralized indebtedness | Incremental Term Loan B-4                
Debt Instrument [Line Items]                
Principal amount   $ 1,000,000,000            
CSC Holdings | Collateralized indebtedness | Incremental Term Loan B-4 | London Interbank Offered Rate (LIBOR)                
Debt Instrument [Line Items]                
Basis spread   3.00%            
Original issue discount   1.00%            
Revolving Credit Facility | CSC Holdings                
Debt Instrument [Line Items]                
Interest rate       0.00% 0.00%      
Debt borrowed       $ 1,050,000,000 $ 1,050,000,000      
Repayments of debt       622,857,000 1,300,000,000      
Maximum borrowing capacity     $ 2,475,000,000 $ 0 $ 0     $ 250,000,000
Debt Instrument, Redemption, Period One | Revolving Credit Facility | CSC Holdings                
Debt Instrument [Line Items]                
Maximum borrowing capacity     $ 2,275,000,000          
Debt Instrument, Redemption, Period One | Revolving Credit Facility | CSC Holdings | London Interbank Offered Rate (LIBOR)                
Debt Instrument [Line Items]                
Basis spread     2.25%          
Debt Instrument, Redemption, Period Two | Revolving Credit Facility | CSC Holdings                
Debt Instrument [Line Items]                
Maximum borrowing capacity     $ 200,000,000          
Debt Instrument, Redemption, Period Two | Revolving Credit Facility | CSC Holdings | London Interbank Offered Rate (LIBOR)                
Debt Instrument [Line Items]                
Basis spread   3.25%