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(LOSS)/EARNINGS PER SHARE (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Earnings Per Share [Abstract]    
Net (loss)/earnings attributable to BMS $ (11,911) $ 2,262
Weighted-average common shares outstanding - basic (in shares) 2,023,000,000 2,099,000,000
Incremental shares attributable to share-based compensation plans (in shares) 0 14,000,000
Weighted-average common shares outstanding - diluted (in shares) 2,023,000,000 2,113,000,000
(Loss)/Earnings per common share    
Basic (usd per share) $ (5.89) $ 1.08
Diluted (usd per share) $ (5.89) $ 1.07
Antidilutive securities excluded from computation of earnings per share, amount (in shares) 46,000,000 0