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Goodwill - Goodwill Activity (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Goodwill [Roll Forward]    
Beginning balance $ 13,070  
Foreign currency translation and other (97)  
Ending balance 12,973  
U.S. Networks    
Goodwill [Roll Forward]    
Beginning balance 10,813  
Foreign currency translation and other 0  
Ending balance 10,813  
Goodwill, accumulated impairments 20 $ 20
International Networks    
Goodwill [Roll Forward]    
Beginning balance 2,257  
Foreign currency translation and other (97)  
Ending balance 2,160  
Goodwill, accumulated impairments $ 1,600 $ 1,600