Segment and Revenue Information (Stock-based Compensation) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Segment Reporting Information [Line Items]
Stock-based compensation	$ 39	$ 44
Operating Segments [Member] | Entertainment [Member]
Segment Reporting Information [Line Items]
Stock-based compensation	16	15
Operating Segments [Member] | Cable Networks [Member]
Segment Reporting Information [Line Items]
Stock-based compensation	3	3
Operating Segments [Member] | Publishing [Member]
Segment Reporting Information [Line Items]
Stock-based compensation	1	1
Operating Segments [Member] | Local Media [Member]
Segment Reporting Information [Line Items]
Stock-based compensation	3	3
Corporate [Member]
Segment Reporting Information [Line Items]
Stock-based compensation	$ 16	$ 22