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2417406 - Disclosure - Pension and Other Postretirement Benefits (Assumptions) (Details)
(http://www.cbscorporation.com/role/PensionAndOtherPostretirementBenefitsAssumptionsDetails)
TableSchedule of Defined Benefit Plans Disclosures [Table]
Slicers (applies to each fact value in each table cell)
Reporting Entity [Axis]0000813828 (http://www.sec.gov/CIK)
Defined Benefit Plan Disclosure [Line Items]Period [Axis]
2016-01-01 - 2016-12-31
2015-01-01 - 2015-12-31
Defined Benefit Plans and Other Postretirement Benefit Plans [Axis]Defined Benefit Plans and Other Postretirement Benefit Plans [Axis]
Pension benefits [Member]Postretirement benefits [Member]Pension benefits [Member]Postretirement benefits [Member]
Weighted average assumptions used to determine benefit obligations at December 31:
 
 
 
 
Discount rate
4.30%  
4.10%  
4.60%  
4.20%  
Rate of compensation increase
3.00%  
 
3.00%  
 
Weighted average assumptions used to determine net periodic costs for the year ended December 31:
 
 
 
 
Discount rate
4.60%  
4.20%  
4.10%  
3.80%  
Expected long-term return on plan assets
6.40%  
2.00%  
6.50%  
2.00%  
Rate of compensation increase
3.00%  
 
3.00%