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Significant Transactions (DreamWorks Animation) (Details) - USD ($)
$ / shares in Units, $ in Millions
Aug. 22, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Business Acquisition [Line Items]        
Goodwill   $ 66,154 $ 36,780 $ 35,980
NBCUniversal Media LLC [Member]        
Business Acquisition [Line Items]        
Goodwill   $ 24,118 $ 23,989 $ 23,323
DreamWorks Animation [Member]        
Business Acquisition [Line Items]        
Consideration transferred $ 3,800      
Business acquisition, price paid per share (in dollars per share) $ 41      
DreamWorks Animation [Member] | NBCUniversal Media LLC [Member]        
Business Acquisition [Line Items]        
Goodwill $ 2,800      
Film and television costs 838      
DreamWorks Animation [Member] | Consideration Transferred By Comcast [Member] | NBCUniversal Media LLC [Member]        
Business Acquisition [Line Items]        
Consideration transferred $ 3,800      
Business acquisition, price paid per share (in dollars per share) $ 41