Segment and Revenue Information (Revenues) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 6,871	$ 6,698	$ 7,143	$ 7,100	$ 7,092	$ 6,630	$ 6,703	$ 6,825	$ 27,812	$ 27,250	$ 26,535
Advertising [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									11,074	10,841	10,582
Affiliate [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									8,602	8,376	8,153
Content Licensing [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									6,483	6,163	5,947
Other [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									292	301	307
Theatrical [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									547	744	716
Operating Segments [Member] | TV Entertainment [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									11,924	11,061	10,476
Operating Segments [Member] | TV Entertainment [Member] | Advertising [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									6,008	5,751	5,696
Operating Segments [Member] | TV Entertainment [Member] | Affiliate [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									2,550	2,082	1,674
Operating Segments [Member] | TV Entertainment [Member] | Content Licensing [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									3,157	3,006	2,880
Operating Segments [Member] | TV Entertainment [Member] | Other [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									209	222	226
Operating Segments [Member] | Cable Networks [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									12,449	12,683	12,479
Operating Segments [Member] | Cable Networks [Member] | Advertising [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									5,129	5,130	4,947
Operating Segments [Member] | Cable Networks [Member] | Affiliate [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									6,052	6,294	6,479
Operating Segments [Member] | Cable Networks [Member] | Content Licensing [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									1,268	1,259	1,053
Operating Segments [Member] | Filmed Entertainment [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									2,990	2,956	3,075
Operating Segments [Member] | Filmed Entertainment [Member] | Other [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									111	102	102
Operating Segments [Member] | Filmed Entertainment [Member] | Theatrical [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									547	744	716
Operating Segments [Member] | Filmed Entertainment [Member] | Home Entertainment [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									623	617	789
Operating Segments [Member] | Filmed Entertainment [Member] | Licensing [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									1,709	1,493	1,468
Operating Segments [Member] | Publishing [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									814	825	830
Corporate/Eliminations [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									(365)	(275)	(325)
Intersegment Eliminations [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									(396)	(306)	(348)
Intersegment Eliminations [Member] | TV Entertainment [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									(226)	(164)	(189)
Intersegment Eliminations [Member] | Cable Networks [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									(53)	(47)	(70)
Intersegment Eliminations [Member] | Filmed Entertainment [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									$ (117)	$ (95)	$ (89)