v2.4.0.8
Income Taxes (Narrative) (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Foreign income before taxes $ 524,000,000 $ 434,000,000 $ 476,000,000
Liability for uncertain tax positions, noncurrent 1,700,000,000    
Unrecognized tax benefits that would impact effective tax rate 980,000,000    
Unrecognized tax benefits, interest on income taxes accrued 780,000,000 721,000,000  
Deferred income taxes 31,935,000,000 30,110,000,000  
Franchise Rights [Member]
      
Net deferred tax liability, franchise rights 23,000,000,000    
NBCUniversal [Member]
      
Foreign income before taxes   434,000,000  
Uncertain Tax Positions Indemnified By GE [Member]
      
Liability for uncertain tax positions, noncurrent 283,000,000    
Unrecognized tax benefits, interest on income taxes accrued 42,000,000 11,000,000  
Redemption Transaction [Member]
      
Deferred income taxes 1,600,000,000    
Other Comprehensive Income (Loss) [Member]
      
Income tax effects allocated directly to equity, other 25,000,000    
Share Based Compensation [Member]
      
Income tax effects allocated directly to equity, other 244,000,000 164,000,000 38,000,000
Domestic Tax Authority
      
Operating loss carryforwards 176,000,000    
Operating loss carryforwards expiration dates Dec. 31, 2033    
Foreign Tax Authority
      
Operating loss carryforwards $ 279,000,000    
Operating loss carryforwards expiration dates Dec. 31, 2023