Reportable Segments (Revenues) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 6,275	$ 7,143	$ 12,944	$ 14,243
Operating Segments [Member] | TV Entertainment [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	2,287	2,938	5,234	6,344
Operating Segments [Member] | Cable Networks [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	3,232	3,176	6,090	6,078
Operating Segments [Member] | Filmed Entertainment [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	647	877	1,458	1,607
Operating Segments [Member] | Publishing [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	200	218	370	382
Corporate and Eliminations [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	(91)	(66)	(208)	(168)
Intersegment Eliminations [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	(91)	(73)	(208)	(182)
Intersegment Eliminations [Member] | TV Entertainment [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	(43)	(38)	(118)	(94)
Intersegment Eliminations [Member] | Cable Networks [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	(2)	(9)	(18)	(27)
Intersegment Eliminations [Member] | Filmed Entertainment [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	(46)	(26)	(72)	(61)
Advertising [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	1,934	2,645	4,418	5,711
Advertising [Member] | Operating Segments [Member] | TV Entertainment [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	951	1,309	2,332	3,276
Advertising [Member] | Operating Segments [Member] | Cable Networks [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	992	1,347	2,109	2,462
Affiliate [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	2,194	2,155	4,391	4,320
Affiliate [Member] | Operating Segments [Member] | TV Entertainment [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	751	616	1,485	1,227
Affiliate [Member] | Operating Segments [Member] | Cable Networks [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	1,443	1,539	2,906	3,093
Content Licensing [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	1,902	1,909	3,496	3,374
Content Licensing [Member] | Operating Segments [Member] | TV Entertainment [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	544	966	1,341	1,747
Content Licensing [Member] | Operating Segments [Member] | Cable Networks [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	797	290	1,075	523
Other [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	42	64	99	132
Other [Member] | Operating Segments [Member] | TV Entertainment [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	41	47	76	94
Other [Member] | Operating Segments [Member] | Filmed Entertainment [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	1	24	29	53
Theatrical [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	3	152	170	324
Theatrical [Member] | Operating Segments [Member] | Filmed Entertainment [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	3	152	170	324
Home Entertainment [Member] | Operating Segments [Member] | Filmed Entertainment [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	209	161	383	315
Licensing [Member] | Operating Segments [Member] | Filmed Entertainment [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 434	$ 540	$ 876	$ 915