CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement of Comprehensive Income [Abstract]
Net loss	$ (607)	$ (152)
Other comprehensive loss
Foreign currency translation adjustment	(124)	(192)
Pension and postretirement benefit plan adjustments, net of income taxes	1	(5)
Other comprehensive loss	(123)	(197)
Comprehensive loss	(730)	(349)
Comprehensive (income) loss attributable to noncontrolling interest	(3)	2
Comprehensive loss attributable to Bausch Health Companies Inc.	$ (733)	$ (347)