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EARNINGS PER SHARE (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Earnings Per Share [Abstract]        
Net earnings/(loss) attributable to BMS $ 1,211 $ 1,928 $ (9,020) $ 6,263
Weighted-average common shares outstanding - basic (in shares) 2,028,000,000 2,057,000,000 2,026,000,000 2,083,000,000
Incremental shares attributable to share-based compensation plans (in shares) 3,000,000 7,000,000 0 10,000,000
Weighted-average common shares outstanding - diluted (in shares) 2,031,000,000 2,064,000,000 2,026,000,000 2,093,000,000
Earnings/(loss) per common share        
Basic (usd per share) $ 0.60 $ 0.94 $ (4.45) $ 3.01
Diluted (usd per share) $ 0.60 $ 0.93 $ (4.45) $ 2.99
Antidilutive securities excluded from computation of earnings per share, amount (in shares) 25,000,000 0 41,000,000 0