EARNINGS/(LOSS) PER SHARE (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Earnings Per Share [Abstract]
Net earnings attributable to BMS	$ 8,025	$ 6,327	$ 6,994
Weighted-average common shares outstanding - basic (in shares)	2,069	2,130	2,221
Incremental shares attributable to share-based compensation plans (in shares)	9	16	24
Weighted-average common shares outstanding - diluted (in shares)	2,078	2,146	2,245
Earnings per common share
Basic (in dollars per share)	$ 3.88	$ 2.97	$ 3.15
Diluted (in dollars per share)	$ 3.86	$ 2.95	$ 3.12