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Reportable Segments (Schedule of Revenues by Segment) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Segment Reporting Information [Line Items]        
Total revenues $ 2,845 $ 1,745 $ 5,152 $ 3,358
U.S. Networks        
Segment Reporting Information [Line Items]        
Total revenues 1,780 890 2,954 1,719
International Networks        
Segment Reporting Information [Line Items]        
Total revenues 1,051 811 2,149 1,558
Education and Other        
Segment Reporting Information [Line Items]        
Total revenues $ 14 $ 44 $ 49 $ 81