(LOSS) EARNINGS PER SHARE - Schedule of Calculation of (Loss) Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Earnings Per Share [Abstract]
Net (loss) income attributable to Bausch Health Companies Inc.	$ (378)	$ 399	$ (553)	$ 185
Basic weighted-average common shares outstanding (in shares)	365.4	362.5	364.5	361.8
Diluted effect of stock options and RSUs (in shares)	0.0	0.9	0.0	1.9
Diluted weighted-average common shares outstanding (in shares)	365.4	363.4	364.5	363.7
(Loss) earnings per share attributable to Bausch Health Companies Inc.
Basic (in usd per share)	$ (1.03)	$ 1.10	$ (1.52)	$ 0.51
Diluted (in usd per share)	$ (1.03)	$ 1.10	$ (1.52)	$ 0.51