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EARNINGS (LOSS) PER SHARE - Schedule of Calculation of Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Earnings Per Share [Abstract]        
Net income (loss) attributable to Bausch Health Companies Inc. $ 399 $ 188 $ 185 $ (1,017)
Basic weighted-average common shares outstanding (in shares) 362.5 359.6 361.8 358.5
Diluted effect of stock options and RSUs (in shares) 0.9 4.4 1.9 0.0
Diluted weighted-average common shares outstanding (in shares) 363.4 364.0 363.7 358.5
Earnings (loss) per share attributable to Bausch Health Companies Inc.        
Basic (in usd per share) $ 1.10 $ 0.52 $ 0.51 $ (2.84)
Diluted (in usd per share) $ 1.10 $ 0.52 $ 0.51 $ (2.84)