Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Statement of Comprehensive Income [Abstract]
Net earnings (ViacomCBS and noncontrolling interests)	$ 519	$ 1,964
Other comprehensive income (loss), net of tax:
Cumulative translation adjustments	(104)	16
Net actuarial loss and prior service costs	17	14
Other comprehensive income (loss), net of tax (ViacomCBS and noncontrolling interests)	(87)	30
Comprehensive income	432	1,994
Less: Comprehensive income attributable to noncontrolling interests	0	8
Comprehensive income attributable to ViacomCBS	$ 432	$ 1,986