LOSS PER SHARE - Schedule of Loss Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Earnings Per Share [Abstract]
Net loss attributable to Bausch Health Companies Inc.	$ (326)	$ (171)	$ (478)	$ (223)
Basic and diluted weighted-average common shares outstanding (in shares)	355.3	352.1	354.3	351.7
Basic and diluted loss per share attributable to Bausch Health Companies Inc. (in usd per share)	$ (0.92)	$ (0.49)	$ (1.35)	$ (0.63)