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Goodwill and Other Intangible Assets (Narrative) (Details)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2017
USD ($)
market
Dec. 31, 2017
USD ($)
reportingunit
market
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Impairment Testing Assumptions [Line Items]        
Number of reporting units | reportingunit   8    
Proceeds from dispositions   $ 11 $ 20 $ 383
Gain on sales of businesses       139
Goodwill disposed       $ 217
Network Ten [Member]        
Impairment Testing Assumptions [Line Items]        
Purchase price $ 124      
FCC Licenses Impairment Test Television Stations [Member]        
Impairment Testing Assumptions [Line Items]        
Number of markets with book value of FCC licenses | market   14    
Number of markets for which the qualitative assessment was performed | market 11 11    
Build-up period   5 years    
Discount rate   7.50%    
Perpetual nominal growth rate 2.00% 2.00%    
Number of markets fair value exceeds carrying value | market 3 3    
Qualitative Assessments [Member]        
Impairment Testing Assumptions [Line Items]        
Number of reporting units | reportingunit   7    
Goodwill Impairment Test [Member] | CBS Sports Network Reporting Unit [Member]        
Impairment Testing Assumptions [Line Items]        
Discount rate   8.50%    
Perpetual nominal growth rate 2.00% 2.00%