Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Statement of Comprehensive Income [Abstract]
Net earnings (ViacomCBS and noncontrolling interests)	$ 726	$ 983	$ 1,245	$ 2,947
Other comprehensive income (loss), net of tax:
Cumulative translation adjustments	37	(8)	(67)	8
Net actuarial loss and prior service costs	18	15	35	29
Other comprehensive income (loss), net of tax (ViacomCBS and noncontrolling interests)	55	7	(32)	37
Comprehensive income	781	990	1,213	2,984
Less: Comprehensive income attributable to noncontrolling interests	245	5	245	13
Comprehensive income attributable to ViacomCBS	$ 536	$ 985	$ 968	$ 2,971