Revenues (Disaggregation of Revenue) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Disaggregation of Revenue [Line Items]
Revenues	$ 7,412	$ 6,499
Advertising [Member]
Disaggregation of Revenue [Line Items]
Revenues	2,681	2,219
Affiliate [Member]
Disaggregation of Revenue [Line Items]
Revenues	2,075	1,968
Streaming [Member]
Disaggregation of Revenue [Line Items]
Revenues	816	494
Theatrical [Member]
Disaggregation of Revenue [Line Items]
Revenues	1	167
Licensing and Other [Member]
Disaggregation of Revenue [Line Items]
Revenues	$ 1,839	$ 1,651