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Stock-Based Compensation - Schedule of Stock Options Roll Forward (Details) (USD $)
9 Months Ended 0 Months Ended 3 Months Ended
Sep. 30, 2014
CBS Corp. Equity and Incentive Plan
Stock options
Jul. 16, 2014
CBS Corp. Equity and Incentive Plan
Stock options
Jul. 16, 2014
Omnibus Stock Incentive Plan
Sep. 30, 2014
Omnibus Stock Incentive Plan
Sep. 30, 2014
Omnibus Stock Incentive Plan
Stock options
Jul. 16, 2014
Omnibus Stock Incentive Plan
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Outstanding, Converted Awards, Number   219,741        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]            
Outstanding as of beginning of period 399,581       390,611  
Exercised (123,260)     (2,426)    
Forfeited or expired (38,523)     (16,170)    
Share-based Compensation Arrangements, Share-based Payment Awards, Options, Converted to Awards, Number     409,207      
Outstanding as of end of period 18,057       390,611  
Exercisable as of September 30, 2014 18,057       166,234  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]            
Weighted average exercise price, options outstanding, beginning balance $ 29.30 $ 33.27     $ 17.67 $ 17.87
Weighted average exercise price, exercised $ 22.04     $ 14.71    
Weighted average exercise price, forfeited $ 30.75     $ 23.08    
Weighted average exercise price, options outstanding, ending balance $ 27.38 $ 33.27     $ 17.67 $ 17.87
Weighted average exercise price, options exercisable $ 27.38       $ 12.29