v3.6.0.2
Significant Transactions (Preliminary Allocation of Purchase Price) (Details) - USD ($)
$ in Millions
Aug. 22, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Business Acquisition [Line Items]        
Goodwill   $ 35,980 $ 32,945 $ 27,316
NBCUniversal Media LLC [Member]        
Business Acquisition [Line Items]        
Goodwill   $ 23,323 $ 20,364 $ 14,908
DreamWorks Animation [Member]        
Business Acquisition [Line Items]        
Film and television costs (see Note 6) $ 854      
Intangible assets (see Note 9) 164      
Working capital 248      
Debt (see Note 10) (381)      
Tax receivable agreement (146)      
Deferred income taxes (see Note 14) 366      
Other noncurrent assets and liabilities and other 137      
Identifiable net assets (liabilities) acquired 1,242      
Noncontrolling interest (89)      
Goodwill 2,620      
Cash consideration transferred by Comcast 3,773      
DreamWorks Animation [Member] | NBCUniversal Media LLC [Member]        
Business Acquisition [Line Items]        
Film and television costs (see Note 6) 854      
Intangible assets (see Note 9) 164      
Working capital 248      
Debt (see Note 10) (381)      
Tax receivable agreement (146)      
Other noncurrent assets and liabilities and other 503      
Identifiable net assets (liabilities) acquired 1,242      
Noncontrolling interest (89)      
Goodwill 2,620      
Cash consideration transferred by Comcast $ 3,773