Segment and Revenue Information (Revenues) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 3,761	$ 3,343
Operating Segments [Member] | Entertainment [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	2,716	2,347
Operating Segments [Member] | Cable Networks [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	609	543
Operating Segments [Member] | Publishing [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	160	161
Operating Segments [Member] | Local Media [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	415	409
Corporate and Eliminations [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	(139)	(117)
Intersegment Eliminations [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	(144)	(122)
Intersegment Eliminations [Member] | Entertainment [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	(139)	(119)
Intersegment Eliminations [Member] | Local Media [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ (5)	$ (3)