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LOSS PER SHARE - Schedule of Calculation of Loss Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Earnings Per Share [Abstract]    
Net loss attributable to Bausch Health Companies Inc. $ (64) $ (201)
Basic weighted-average common shares outstanding (in shares) 366,800 363,300
Diluted weighted-average common shares outstanding (in shares) 366,800 363,300
Loss per share attributable to Bausch Health Companies Inc.    
Basic loss per share attributable to Bausch Health Companies Inc. (in usd per share) $ (0.17) $ (0.55)
Diluted loss per share attributable to Bausch Health Companies Inc. (in usd per share) $ (0.17) $ (0.55)