Segment and Revenue Information (Revenues) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 3,466	$ 3,257	$ 7,227	$ 6,600
Operating Segments [Member] | Entertainment [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	2,365	2,184	5,081	4,531
Operating Segments [Member] | Cable Networks [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	591	571	1,200	1,114
Operating Segments [Member] | Publishing [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	207	206	367	367
Operating Segments [Member] | Local Media [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	420	412	835	821
Corporate and Eliminations [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	(117)	(116)	(256)	(233)
Intersegment Eliminations [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	(125)	(121)	(269)	(243)
Intersegment Eliminations [Member] | Entertainment [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	(120)	(118)	(259)	(237)
Intersegment Eliminations [Member] | Local Media [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ (5)	$ (3)	$ (10)	$ (6)