Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement of Comprehensive Income [Abstract]
Net earnings (ViacomCBS and noncontrolling interests)	$ 627	$ 646	$ 1,872	$ 3,593
Other comprehensive income (loss), net of tax:
Cumulative translation adjustments	72	(68)	5	(60)
Net actuarial loss and prior service costs	17	17	52	46
Other comprehensive income (loss), net of tax (ViacomCBS and noncontrolling interests)	89	(51)	57	(14)
Comprehensive income	716	595	1,929	3,579
Less: Comprehensive income attributable to noncontrolling interests	12	16	257	29
Comprehensive income attributable to ViacomCBS	$ 704	$ 579	$ 1,672	$ 3,550