Bank Financing and Debt (Details) (USD $)	6 Months Ended
	Jun. 30, 2013	Dec. 31, 2012
Bank Financing And Debt Details [Abstract]
Commercial paper	$ 453,000,000	$ 0
Senior debt (1.95% - 8.875% due 2014 - 2042)	5,862,000,000	5,863,000,000
Obligations under capital leases	121,000,000	72,000,000
Less current portion of long-term debt	21,000,000	18,000,000
Total long-term debt from continuing operations, net of current portion	5,949,000,000	5,904,000,000
Total Debt [Line Items]
Total debt	6,436,000,000	5,935,000,000
Bank Financing And Debt Parenthetical [Abstract]
Minimum interest rate of senior debt	1.95%
Maximum interest rate of senior debt	8.875%
Net unamortized discount on senior debt	15,000,000	16,000,000
Increase in carrying value of debt relating to previously settled fair value hedges	21,000,000	23,000,000
Face value of senior debt	5,860,000,000	5,860,000,000
Senior debt not guaranteed by CBS Operations Inc.	52,000,000
Debt due within one year reflecting intent and ability to refinance on a long-term basis	99,000,000
Maximum Consolidated Leverage Ratio [Member]
Debt Covenants [Line Items]
Credit Facility covenant description	4.5x
Consolidated Leverage Ratio [Member]
Debt Covenants [Line Items]
Credit Facility covenant compliance	1.7x
Revolving Credit Facility [Member]
Credit Facility [Line Items]
Maximum borrowing capacity under the credit facility	2,000,000,000
Availability under the credit facility	1,990,000,000
Commercial Paper [Member]
Credit Facility [Line Items]
Maximum borrowing capacity under the credit facility	2,000,000,000
Weighted average interest rate	0.30%
Continuing Operations [Member]
Total Debt [Line Items]
Total debt	6,423,000,000	5,922,000,000
Discontinued Operations [Member]
Total Debt [Line Items]
Total debt	$ 13,000,000	$ 13,000,000