Registration of securities issued in business combination transactions

Cable and Satellite Television Distribution Rights, Net (Details)

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Cable and Satellite Television Distribution Rights, Net (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Finite-lived and Indefinite-lived Intangible Assets by Major Class [Line Items]          
Cable and satellite television distribution rights $ 5,480   $ 5,503 $ 5,388  
Less accumulated amortization 2,019   1,994 1,764  
Weighted average remaining life     4 years 3 months 18 days    
Amortization of intangible assets 104 96 400 439 395
Cable and satellite television distribution rights
         
Finite-lived and Indefinite-lived Intangible Assets by Major Class [Line Items]          
Cable and satellite television distribution rights 2,276   2,304 2,284  
Less accumulated amortization (1,554)   (1,540) (1,379)  
Cable and satellite television distribution rights, net 722   764 905  
Weighted average remaining life     4 years 9 months 18 days    
Amortization of intangible assets $ 42 $ 41 $ 163 $ 167 $ 169