LOSS PER SHARE - Schedule of Calculation of Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Earnings Per Share [Abstract]
Net loss attributable to Bausch Health Companies Inc.	$ (69)	$ (610)
Basic weighted-average common shares outstanding (in shares)	360.8	356.8
Diluted weighted-average common shares outstanding (in shares)	360.8	356.8
Basic loss per share attributable to Bausch Health Companies Inc. (in usd per share)	$ (0.19)	$ (1.71)
Diluted loss per share attributable to Bausch Health Companies Inc. (in usd per share)	$ (0.19)	$ (1.71)