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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, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Earnings Per Share [Abstract]        
Net loss attributable to Bausch Health Companies Inc. $ (595) $ (326) $ (1,205) $ (478)
Basic weighted-average common shares (in shares) 359.1 355.3 358.0 354.3
Diluted weighted-average common shares (in shares) 359.1 355.3 358.0 354.3
Basic loss per share attributable to Bausch Health Companies Inc. (in usd per share) $ (1.66) $ (0.92) $ (3.37) $ (1.35)
Diluted loss per share attributable to Bausch Health Companies Inc. (in usd per share) $ (1.66) $ (0.92) $ (3.37) $ (1.35)