(LOSS)/EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Earnings Per Share [Abstract]
Net (loss)/earnings attributable to BMS	$ (8,948)	$ 8,025	$ 6,327
Weighted-average common shares outstanding - basic (in shares)	2,027	2,069	2,130
Incremental shares attributable to share-based compensation plans (in shares)	0	9	16
Weighted-average common shares outstanding - diluted (in shares)	2,027	2,078	2,146
(Loss)/Earnings per common share
Basic (in dollars per share)	$ (4.41)	$ 3.88	$ 2.97
Diluted (in dollars per share)	$ (4.41)	$ 3.86	$ 2.95
Antidilutive securities excluded from computation of earnings per share, amount (in shares)	38