Goodwill and Other Intangible Assets Testing (Details) $ in Millions	12 Months Ended
	Dec. 31, 2015 USD ($) reportingunit market	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Impairment Testing Assumptions [Line Items]
Number of Reporting Units | reportingunit	7
Number of reporting units for which the qualitative assessment was performed | reportingunit	3
Goodwill, net of impairment | $	$ 6,481	$ 6,698	$ 6,588
CBS Radio Reporting Unit [Member]
Impairment Testing Assumptions [Line Items]
Goodwill, net of impairment | $	$ 1,860
FCC Licenses Impairment Test Television Stations [Member]
Impairment Testing Assumptions [Line Items]
Number of markets with book value of FCC licenses	14
Number of markets for which the qualitative assessment was performed	10
Discount rate	8.00%
Perpetual nominal growth rate	2.50%
Number of markets fair value exceeds carrying value	4
FCC Licenses Impairment Test Radio Stations [Member]
Impairment Testing Assumptions [Line Items]
Number of markets with book value of FCC licenses	25
Discount rate	7.75%
Perpetual nominal growth rate	1.00%
Number of radio markets impairment	18
Number of markets fair value exceeds carrying value	7
Goodwill Impairment Test [Member]
Impairment Testing Assumptions [Line Items]
Number of reporting units for which the first step of the goodwill impairment test was performed | reportingunit	4
Number of reporting units fair value exceeds carrying value | reportingunit	4
Goodwill Impairment Test [Member] | CBS Interactive Reporting Unit [Member]
Impairment Testing Assumptions [Line Items]
Discount rate	9.50%
Perpetual nominal growth rate	2.50%
Goodwill Impairment Test [Member] | CBS Radio Reporting Unit [Member]
Impairment Testing Assumptions [Line Items]
Discount rate	8.00%
Perpetual nominal growth rate	1.50%
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%
Goodwill Impairment Test [Member] | Publishing Reporting Unit [Member]
Impairment Testing Assumptions [Line Items]
Discount rate	8.50%
Perpetual nominal growth rate	1.50%