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EARNINGS (LOSS) PER SHARE - Calculation of Earnings (Loss) Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Earnings Per Share [Abstract]        
Net income (loss) attributable to Bausch Health Companies Inc. $ 179 $ (85) $ 269 $ (139)
Basic weighted-average common shares outstanding (in shares) 371.3 368.4 370.6 367.7
Diluted effect of stock options and RSUs (in shares) 4.2 0.0 3.5 0.0
Diluted weighted-average common shares outstanding (in shares) 375.5 368.4 374.1 367.7
Basic earnings (loss) per share attributable to Bausch Health Companies Inc. (in dollars per share) $ 0.48 $ (0.23) $ 0.73 $ (0.38)
Diluted earnings (loss) per share attributable to Bausch Health Companies Inc. (in dollars per share) $ 0.48 $ (0.23) $ 0.72 $ (0.38)