EARNINGS (LOSS) PER SHARE - Schedule of Calculation of Loss Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Earnings Per Share [Abstract]
Net loss attributable to Bausch Health Companies Inc.	$ (201)	$ (69)
Basic weighted-average common shares outstanding (in shares)	363.3	360.8
Diluted weighted-average common shares outstanding (in shares)	363.3	360.8
Basic loss per share attributable to Bausch Health Companies Inc. (in usd per share)	$ (0.55)	$ (0.19)
Diluted loss per share attributable to Bausch Health Companies Inc. (in usd per share)	$ (0.55)	$ (0.19)