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DEBT - Narrative (Details) - USD ($)
1 Months Ended 6 Months Ended
May 31, 2019
Feb. 28, 2019
Jan. 31, 2019
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Debt Instrument [Line Items]            
Principal amount       $ 24,066,171,000   $ 23,296,581,000
Debt borrowed       23,640,509,000   22,812,600,000
Repayments of debt       602,830,000 $ 621,325,000  
Deferred financing costs $ 1,195,000          
Collateralized indebtedness            
Debt Instrument [Line Items]            
Principal amount       $ 1,459,638,000   1,459,638,000
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       4.73%    
Debt borrowed       $ 950,000,000    
Repayments of debt       577,143,000    
Maximum borrowing capacity     $ 2,475,000,000 $ 622,857,000   $ 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%