LOSS PER SHARE - Schedule of Calculation of Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Earnings Per Share [Abstract]
Net loss attributable to Bausch Health Companies Inc.	$ (145)	$ (595)	$ (214)	$ (1,205)
Basic weighted-average common shares outstanding (in shares)	362.2	359.1	361.5	358.0
Diluted weighted-average common shares outstanding (in shares)	362.2	359.1	361.5	358.0
Basic loss per share attributable to Bausch Health Companies Inc. (in usd per share)	$ (0.40)	$ (1.66)	$ (0.59)	$ (3.37)
Diluted loss per share attributable to Bausch Health Companies Inc. (in usd per share)	$ (0.40)	$ (1.66)	$ (0.59)	$ (3.37)