XML 106 R94.htm IDEA: XBRL DOCUMENT v3.7.0.1
Reportable Segments (Schedule Of Revenues By Segment) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Segment Reporting Information [Line Items]        
Revenues by segment $ 1,745 $ 1,708 $ 3,358 $ 3,269
U.S. Networks [Member]        
Segment Reporting Information [Line Items]        
Revenues by segment 890 873 1,719 1,680
International Networks [Member]        
Segment Reporting Information [Line Items]        
Revenues by segment 811 790 1,558 1,501
Education And Other [Member]        
Segment Reporting Information [Line Items]        
Revenues by segment 44 46 81 90
Corporate And Inter-Segment Eliminations [Member]        
Segment Reporting Information [Line Items]        
Revenues by segment $ 0 $ (1) $ 0 $ (2)