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Investments (Cost Method Investments) (Details)
$ in Millions
Sep. 30, 2015
USD ($)
Vox Media [Member]  
Cost Method Investments,Original Cost $ 200
Vox Media [Member] | NBCUniversal Media, LLC [Member]  
Cost Method Investments,Original Cost 200
BuzzFeed [Member]  
Cost Method Investments,Original Cost 200
BuzzFeed [Member] | NBCUniversal Media, LLC [Member]  
Cost Method Investments,Original Cost 200
Air Touch [Member]  
Fair value of AirTouch preferred stock related to redeemable preferred shares 1,700
Fair value of redeemable preferred shares $ 1,700