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LOSS PER SHARE - Schedule of Loss Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Earnings Per Share [Abstract]    
Net loss attributable to Bausch Health Companies Inc. $ (152) $ (52)
Basic and diluted weighted-average common shares outstanding (in shares) 353.4 351.3
Basic and diluted loss per share attributable to Bausch Health Companies Inc. (in usd per share) $ (0.43) $ (0.15)