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Reportable Segments (Schedule of Content Rights Expense and Impairment) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Segment Reporting Information [Line Items]      
Total content rights expense and impairment $ 751 $ 458 $ 458
Operating Segments | U.S. Networks      
Segment Reporting Information [Line Items]      
Total content rights expense and impairment 275   178
Operating Segments | International Networks      
Segment Reporting Information [Line Items]      
Total content rights expense and impairment 474   277
Operating Segments | Education and Other      
Segment Reporting Information [Line Items]      
Total content rights expense and impairment 1   2
Corporate and inter-segment eliminations      
Segment Reporting Information [Line Items]      
Total content rights expense and impairment $ 1   $ 1