Restructuring and Other Charges (By Reporting Segment) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting Information [Line Items]
Restructuring and other charges	$ 53	$ 8	$ 75	$ 20
Operating Segments | U.S. Networks
Segment Reporting Information [Line Items]
Restructuring and other charges	29	4	41	11
Operating Segments | International Networks
Segment Reporting Information [Line Items]
Restructuring and other charges	13	5	17	15
Corporate, inter-segment eliminations, and other | Corporate, inter-segment eliminations, and other
Segment Reporting Information [Line Items]
Restructuring and other charges	$ 11	$ (1)	$ 17	$ (6)