Restructuring and Other Charges (By Reporting 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]
Restructuring and other charges	$ 7	$ 7	$ 22	$ 12
Operating Segments | U.S. Networks
Segment Reporting Information [Line Items]
Restructuring and other charges	0	3	12	7
Operating Segments | International Networks
Segment Reporting Information [Line Items]
Restructuring and other charges	3	6	4	10
Corporate, inter-segment eliminations, and other | Corporate, inter-segment eliminations, and other
Segment Reporting Information [Line Items]
Restructuring and other charges	$ 4	$ (2)	$ 6	$ (5)