EARNINGS/(LOSS) PER SHARE (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Earnings Per Share [Abstract]
Net Earnings/(Loss) Attributable to BMS Used for Basic and Diluted EPS Calculation	$ 1,055	$ (85)	$ 3,076	$ (860)
Weighted-average common shares outstanding - basic	2,227	2,263	2,232	2,261
Incremental shares attributable to share-based compensation plans	25	0	26	0
Weighted-average common shares outstanding - diluted	2,252	2,263	2,258	2,261
Earnings/(Loss) Per Share, Basic	$ 0.47	$ (0.04)	$ 1.38	$ (0.38)
Earnings/(Loss) Per Share, Diluted	$ 0.47	$ (0.04)	$ 1.36	$ (0.38)
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	9	127	9	127