EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Earnings Per Share [Abstract]
Net (Loss)/Earnings Attributable to BMS Used for Basic and Diluted EPS Calculation	$ 2,021	$ (775)
Weighted-average common shares outstanding - basic	2,236	2,258
Incremental shares attributable to share-based compensation plans	29	0
Weighted-average common shares outstanding - diluted	2,265	2,258
Earnings Per Share, Basic	$ 0.90	$ (0.34)
Earnings Per Share, Diluted	$ 0.89	$ (0.34)
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	14	138