Revenues (Disaggregation of Revenue) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Disaggregation of Revenue [Line Items]
Revenues	$ 6,275	$ 7,143	$ 12,944	$ 14,243
Advertising [Member]
Disaggregation of Revenue [Line Items]
Revenues	1,934	2,645	4,418	5,711
Affiliate [Member]
Disaggregation of Revenue [Line Items]
Revenues	2,194	2,155	4,391	4,320
Content Licensing [Member]
Disaggregation of Revenue [Line Items]
Revenues	1,902	1,909	3,496	3,374
Theatrical [Member]
Disaggregation of Revenue [Line Items]
Revenues	3	152	170	324
Publishing [Member]
Disaggregation of Revenue [Line Items]
Revenues	200	218	370	382
Other [Member]
Disaggregation of Revenue [Line Items]
Revenues	$ 42	$ 64	$ 99	$ 132