v3.4.0.3
Investments (Equity Method Investments) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Equity in net income (losses) of investees, net $ (11) $ 33
Atairos [Member]    
Percentage losses in Atairos Group 99.00%  
Percentage of residual returns in Atairos Group 86.50%  
Capital contribution $ 404  
Annual management fee 40  
The Weather Channel [Member]    
Gain on sale of The Weather Channel product and technology businesses 108  
The Weather Channel [Member] | NBCUniversal Media LLC [Member]    
Gain on sale of The Weather Channel product and technology businesses 108  
Hulu [Member]    
Equity in net income (losses) of investees, net (25) (11)
Hulu [Member] | NBCUniversal Media LLC [Member]    
Equity in net income (losses) of investees, net (25) $ (11)
Comcast corporation capital contribution [Member] | Atairos [Member]    
Capital contribution agreement 4,000  
Management company investors capital contribution [Member] | Atairos [Member]    
Capital contribution agreement 100  
Former CFO capital contribution [Member] | Atairos [Member]    
Capital contribution agreement $ 40  
Term [Member] | Atairos [Member]    
Term 12 years