Supplemental Financial Information (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Variable Interest Entities
Assets	$ 51,188			$ 51,188		$ 49,519
Revenues	6,275	$ 7,143		12,944	$ 14,243
Operating income	1,286	1,446		2,203	3,250
Gain on Sale of Assets
Sale of property and sound stage				146	751
Gain on sale of assets	0	0		0	549
Lease Income
Lease income	$ 19	$ 38		$ 53	78
CBS Television City [Member]
Gain on Sale of Assets
Sale of property and sound stage			$ 750
Guaranteed cash flow period			5 years
Gain on sale of property and sound stage operation, net					$ 386
ConsolidatedVIE [Member]
Variable Interest Entities
Ownership of consolidated VIE	51.00%			51.00%
Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entities
Assets	$ 1,310			$ 1,310		141
Liabilities	219			219		$ 22
Revenues	538			556
Operating income	$ 500			$ 498