Reportable Segments (Revenues) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 6,669	$ 7,100
Operating Segments [Member] | TV Entertainment [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	2,947	3,406
Operating Segments [Member] | Cable Networks [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	2,858	2,902
Operating Segments [Member] | Filmed Entertainment [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	811	730
Operating Segments [Member] | Publishing [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	170	164
Corporate and Eliminations [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	(117)	(102)
Intersegment Eliminations [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	(117)	(109)
Intersegment Eliminations [Member] | TV Entertainment [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	(75)	(56)
Intersegment Eliminations [Member] | Cable Networks [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	(16)	(18)
Intersegment Eliminations [Member] | Filmed Entertainment [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	(26)	(35)
Advertising [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	2,484	3,066
Advertising [Member] | Operating Segments [Member] | TV Entertainment [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	1,381	1,967
Advertising [Member] | Operating Segments [Member] | Cable Networks [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	1,117	1,115
Affiliate [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	2,197	2,165
Affiliate [Member] | Operating Segments [Member] | TV Entertainment [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	734	611
Affiliate [Member] | Operating Segments [Member] | Cable Networks [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	1,463	1,554
Content Licensing [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	1,594	1,465
Content Licensing [Member] | Operating Segments [Member] | TV Entertainment [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	797	781
Content Licensing [Member] | Operating Segments [Member] | Cable Networks [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	278	233
Other [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	57	68
Other [Member] | Operating Segments [Member] | TV Entertainment [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	35	47
Other [Member] | Operating Segments [Member] | Filmed Entertainment [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	28	29
Theatrical [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	167	172
Theatrical [Member] | Operating Segments [Member] | Filmed Entertainment [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	167	172
Home Entertainment [Member] | Operating Segments [Member] | Filmed Entertainment [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	174	154
Licensing [Member] | Operating Segments [Member] | Filmed Entertainment [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 442	$ 375