Goodwill and Other Intangible Assets Testing (Details) $ in Millions	12 Months Ended
	Dec. 31, 2016 reportingunit market	Dec. 31, 2015 USD ($)
Impairment Testing Assumptions [Line Items]
Gain on sales of businesses | $		$ 139
Number of Reporting Units | reportingunit	11
Number of reporting units for which the qualitative assessment was performed | reportingunit	7
CBS Radio [Member]
Impairment Testing Assumptions [Line Items]
Number of Reporting Units | reportingunit	3
Local Media Segment [Member]
Impairment Testing Assumptions [Line Items]
Number of Reporting Units | reportingunit	3
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	3
Discount rate	8.00%
Perpetual nominal growth rate	2.50%
Number of markets fair value exceeds carrying value | market	11
F C C Licences Impairment Test Radio Stations [Member]
Impairment Testing Assumptions [Line Items]
Number of markets with book value of FCC licenses | market	25
Goodwill Impairment Test [Member] | CBS Sports Network Reporting Unit [Member]
Impairment Testing Assumptions [Line Items]
Discount rate	9.00%
Perpetual nominal growth rate	2.00%