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SUBSEQUENT EVENTS (Details) - USD ($)
1 Months Ended 9 Months Ended
Oct. 07, 2019
Oct. 04, 2019
Oct. 31, 2019
May 31, 2019
Sep. 30, 2019
Sep. 30, 2018
Oct. 03, 2019
Jul. 31, 2019
Dec. 31, 2018
Subsequent Event [Line Items]                  
Principal amount         $ 24,445,380,000       $ 23,296,581,000
Repayments of Lines of Credit         1,342,625,000 $ 635,738,000      
Deferred financing costs       $ 1,195,000          
Stock Repurchase Program, Number of Shares Authorized to be Repurchased           $ 2,000,000,000.0      
Secured Debt [Member]                  
Subsequent Event [Line Items]                  
Principal amount         1,459,638,000       1,459,638,000
2019 Share Repurchase Authorization [Member]                  
Subsequent Event [Line Items]                  
Stock Repurchase Program, Number of Shares Authorized to be Repurchased               $ 5,000,000,000.0  
Cablevision Systems Corp. [Member] | Senior Notes                  
Subsequent Event [Line Items]                  
Principal amount         16,148,259,000       15,733,145,000
Cablevision Systems Corp. [Member] | Cablevision 8.0% Notes due April 15, 2020 [Member] | Senior Notes                  
Subsequent Event [Line Items]                  
Principal amount         $ 500,000,000       500,000,000
Interest rate         8.00%        
Cablevision Systems Corp. [Member] | Cablevision 5.875% Notes due September 15, 2022 | Senior Notes                  
Subsequent Event [Line Items]                  
Principal amount         $ 649,024,000       649,024,000
Interest rate         5.875%        
Cablevision Systems Corp. [Member] | Cablevision 7.750% Notes due July 15, 2025 | Senior Notes                  
Subsequent Event [Line Items]                  
Principal amount         $ 1,740,000       1,740,000
Interest rate         7.75%        
Cablevision Systems Corp. [Member] | Cablevision 7.500% Notes due April 1, 2028 | Senior Notes                  
Subsequent Event [Line Items]                  
Principal amount         $ 4,118,000       4,118,000
Interest rate         7.50%        
CSC Holdings [Member] | Subsequent Event                  
Subsequent Event [Line Items]                  
Payments of Capital Distribution     $ 500,000,000            
CSC Holdings [Member] | CSC Holdings 5.75% Notes due 2030 [Member] | Senior Notes                  
Subsequent Event [Line Items]                  
Principal amount         $ 1,000,000,000       0
Interest rate         5.75%        
CSC Holdings [Member] | CSC Holdings 5.75% Notes due 2030 [Member] | Senior Notes | Subsequent Event                  
Subsequent Event [Line Items]                  
Principal amount $ 1,250,000,000                
Interest rate 5.75%                
CSC Holdings [Member] | CSC Holdings 5.75% Notes due 2030 [Member] | Secured Debt [Member] | Subsequent Event                  
Subsequent Event [Line Items]                  
Principal amount $ 1,000,000,000                
Debt instrument, premium received $ 1.0400                
CSC Holdings [Member] | CSC Holdings 5.125% Notes due December 15, 2021 [Member] | Senior Notes                  
Subsequent Event [Line Items]                  
Principal amount         $ 1,240,762,000       $ 1,240,762,000
CSC Holdings [Member] | CSC Holdings 5.125% Notes due December 15, 2021 [Member] | Senior Notes | Subsequent Event                  
Subsequent Event [Line Items]                  
Interest rate 5.125%                
Deferred financing costs $ 65,000,000                
CSC Holdings [Member] | Senior Notes Due January 2030 | Senior Notes                  
Subsequent Event [Line Items]                  
Principal amount               $ 1,000,000,000  
Term Loans B-2 and B-4 [Member] | Subsequent Event                  
Subsequent Event [Line Items]                  
Repayments of Lines of Credit   $ 2,500,000,000              
Deferred financing costs   $ 28,000,000              
Credit facility debt | CSC Holdings [Member] | Incremental Term Loan B-5 [Member] | Subsequent Event                  
Subsequent Event [Line Items]                  
Interest rate             300000000000.00%    
Debt Instrument, Redemption, Period One [Member] | Incremental Term Loan B-5 [Member] | CSC Holdings [Member] | Subsequent Event                  
Subsequent Event [Line Items]                  
Debt Instrument, Call Feature             1.00%    
Debt Instrument, Redemption, Period One [Member] | London Interbank Offered Rate (LIBOR) [Member] | Incremental Term Loan B-5 [Member] | CSC Holdings [Member] | Subsequent Event                  
Subsequent Event [Line Items]                  
Debt Instrument, Basis Spread on Variable Rate   2.50%              
Debt Instrument, Redemption, Period One [Member] | Base Rate [Member] | Incremental Term Loan B-5 [Member] | CSC Holdings [Member] | Subsequent Event                  
Subsequent Event [Line Items]                  
Debt Instrument, Basis Spread on Variable Rate   1.50%