EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Earnings Per Share [Abstract]
Net (Loss)/Earnings Attributable to BMS Used for Basic and Diluted EPS Calculation	$ (85)	$ 1,432	$ (860)	$ 3,142
Weighted-average common shares outstanding - basic	2,263	1,636	2,261	1,635
Incremental shares attributable to share-based compensation plans	0	1	0	2
Weighted-average common shares outstanding - diluted	2,263	1,637	2,261	1,637
Earnings Per Share, Basic	$ (0.04)	$ 0.88	$ (0.38)	$ 1.92
Earnings Per Share, Diluted	$ (0.04)	$ 0.87	$ (0.38)	$ 1.92
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	127		127