EARNINGS PER SHARE (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2013	Mar. 31, 2012
Earnings Per Share [Abstract]
Net Earnings Attributable to BMS	$ 609	$ 1,101
Earnings attributable to unvested restricted shares		(1)
Net Earnings Attributable to BMS common shareholders	$ 609	$ 1,100
Earnings per share - basic	$ 0.37	$ 0.65
Weighted-average common shares outstanding - basic	1,638	1,687
Contingently convertible debt common stock equivalents	1	1
Incremental shares attributable to share-based compensation plans	16	18
Weighted-average common shares outstanding - diluted	1,655	1,706
Earnings per share - diluted	$ 0.37	$ 0.64
Anti-dilutive weighted-average equivalent shares - stock incentive plans	1	7

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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