EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Earnings Per Share [Abstract]
Net (Loss)/Earnings Attributable to BMS Used for Basic and Diluted EPS Calculation	$ 1,872	$ 1,353	$ 1,012	$ 4,495
Weighted-average common shares outstanding - basic	2,257	1,632	2,260	1,634
Incremental shares attributable to share-based compensation plans	33	2	35	2
Weighted-average common shares outstanding - diluted	2,290	1,634	2,295	1,636
Earnings Per Share, Basic	$ 0.83	$ 0.83	$ 0.45	$ 2.75
Earnings Per Share, Diluted	$ 0.82	$ 0.83	$ 0.44	$ 2.75
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	27		29