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EARNINGS/(LOSS) PER SHARE (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Earnings Per Share [Abstract]    
Net earnings/(loss) attributable to BMS $ 2,456 $ (11,911)
Weighted-average common shares outstanding - basic (in shares) 2,031,000,000 2,023,000,000
Incremental shares attributable to share-based compensation plans (in shares) 9,000,000 0
Weighted-average common shares outstanding - diluted (in shares) 2,040,000,000 2,023,000,000
Earnings/(Loss) per common share    
Basic (usd per share) $ 1.21 $ (5.89)
Diluted (usd per share) $ 1.20 $ (5.89)
Antidilutive securities excluded from computation of earnings per share, amount (in shares) 0 46,000,000