Reportable Segments (Schedule of Adjusted OIBDA by Segment) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Segment Reporting Information [Line Items]
Total Adjusted OIBDA	$ 1,127	$ 1,281	$ 2,240	$ 2,440
Operating Segments | U.S. Networks
Segment Reporting Information [Line Items]
Total Adjusted OIBDA	1,062	1,126	2,078	2,187
Operating Segments | International Networks
Segment Reporting Information [Line Items]
Total Adjusted OIBDA	193	286	400	505
Operating Segments | Other
Segment Reporting Information [Line Items]
Total Adjusted OIBDA	$ (128)	$ (131)	$ (238)	$ (252)