Discontinued Operations Additional Disclosures (Details) - USD ($)		12 Months Ended
	Jul. 16, 2014	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Oct. 31, 2016	Apr. 02, 2014
Discontinued Operations and Disposal Groups [Abstract]
Total cash received from disposition of Outdoor Americas				$ 2,040,000,000
Percentage of CBS Outdoor Americas offered in IPO						19.00%
Shares of CBS Outdoor Americas common stock owned by CBS	97,000,000
Percentage of CBS Outdoor Americas owned by CBS	81.00%
Shares of CBS Class B Common Stock received in Split-Off transaction	44,723,131
Share price	$ 60.85	$ 63.62
Value of all consideration received from significant disposal				4,760,000,000
Fair value of CBS Corp Class B common stock accepted		$ 0	$ 0	2,721,000,000
Carrying value of Outdoor Americas				(1,162,000,000)
Transaction costs				(32,000,000)
Discontinued Operations Additional Disclosures [Line Items]
Face value of debt		9,470,000,000	8,520,000,000
Accumulated other comprehensive income		(169,000,000)	(36,000,000)	7,000,000
Discontinued Operations [Member]
Discontinued Operations Additional Disclosures [Line Items]
Face value of debt					$ 1,460,000,000
Accumulated other comprehensive income		$ 0	$ 0	$ 30,000,000