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 |