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Long-term Debt (Debt Repayments) (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Repurchases and repayments of debt $ 4,353 $ 3,172
Loss on early extinguishment of debt 47  
NBCUniversal Media, LLC [Member]    
Repurchases and repayments of debt 1,004 $ 904
Senior 8.75% Notes Due 2015 [Member]    
Repurchases and repayments of debt $ 673  
Interest rate 8.75%  
Maturity date 2015  
Senior 6.50% Notes Due 2015 [Member]    
Repurchases and repayments of debt $ 900  
Interest rate 6.50%  
Maturity date 2015  
Senior 3.65% Notes Due 2015 [Member]    
Repurchases and repayments of debt $ 1,000  
Interest rate 3.65%  
Maturity date 2015  
Senior 3.65% Notes Due 2015 [Member] | NBCUniversal Media, LLC [Member]    
Repurchases and repayments of debt $ 1,000  
Interest rate 3.65%  
Maturity date 2015  
Senior 5.85% Notes Due November 2015 [Member]    
Early repayment of senior debt $ 750  
Interest rate 5.85%  
Maturity date November 2015  
Senior 5.90% Notes Due March 2016 [Member]    
Early repayment of senior debt $ 1,000  
Interest rate 5.90%  
Maturity date March 2016