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Reportable Segments (Schedule Of Total Assets By Segment) (Details) - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Segment Reporting Information [Line Items]    
Total assets $ 16,149 $ 15,672
U.S. Networks [Member]    
Segment Reporting Information [Line Items]    
Total assets 3,598 3,412
International Networks [Member]    
Segment Reporting Information [Line Items]    
Total assets 5,205 4,922
Education And Other [Member]    
Segment Reporting Information [Line Items]    
Total assets 376 399
Corporate And Inter-Segment Eliminations [Member]    
Segment Reporting Information [Line Items]    
Total assets $ 6,970 $ 6,939