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Related Parties (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
interest
trustee
Jun. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Related Party Transaction [Line Items]          
SMR Trust ownership in NAI 80.00%   80.00%    
National Amusements, Inc. [Member]          
Related Party Transaction [Line Items]          
NAI ownership of CBS Corp. Class A Common Stock (percentage) 79.50%   79.50%    
NAI ownership of CBS Corp. Class A and Class B Common Stock on a combined basis (percentage) 9.70%   9.70%    
Number of trustees | trustee     7    
Viacom Inc. [Member]          
Related Party Transaction [Line Items]          
Revenues from transactions with related parties $ 19 $ 31 $ 73 $ 67  
Expenses from transactions with related parties 4 4 9 11  
Receivables 86   86   $ 113
Other assets (Receivables, noncurrent) 51   51   35
Total amounts due from related parties 137   137   148
Domestic and International Television Joint Ventures [Member]          
Related Party Transaction [Line Items]          
Revenues from transactions with related parties 20 $ 24 49 $ 56  
Total amounts due from related parties $ 40   $ 40   $ 47
Number of equity interests | interest     2