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Bank Financing and Debt (Details) (USD $)
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Bank Financing And Debt Details [Abstract]      
Commercial paper $ 550,000,000   $ 0
Senior debt (1.95% - 8.875% due 2014 - 2042) 5,862,000,000   5,863,000,000
Obligations under capital leases 68,000,000   72,000,000
Less current portion of long-term debt 16,000,000   18,000,000
Total long-term debt from continuing operations, net of current portion 5,901,000,000   5,904,000,000
Total Debt [Line Items]      
Total debt 6,480,000,000   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 16,000,000   16,000,000
Increase in carrying value of debt relating to previously settled fair value hedges 22,000,000   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 Instrument [Line Items]      
Gain on early extinguishment of debt 0 25,000,000  
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 0.40%    
Senior Notes Due 2022 [Member]
     
Debt Instrument [Line Items]      
Debt Issuances   700,000,000  
Interest rate   3.375%  
Senior Notes Due 2056 [Member]
     
Debt Instrument [Line Items]      
Repayment of debt instrument   700,000,000  
Interest rate   6.75%  
Continuing Operations [Member]
     
Total Debt [Line Items]      
Total debt 6,467,000,000   5,922,000,000
Discontinued Operations [Member]
     
Total Debt [Line Items]      
Total debt $ 13,000,000   $ 13,000,000