EARNINGS PER SHARE (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Earnings Per Share [Abstract]
Net Earnings Attributable to BMS	$ 536	$ 645	$ 1,145	$ 1,746
Earnings attributable to unvested restricted shares				(2)
Net Earnings Attributable to BMS common shareholders	$ 536	$ 645	$ 1,145	$ 1,744
Earnings per share - basic	$ 0.33	$ 0.38	$ 0.70	$ 1.04
Weighted-average common shares outstanding - basic	1,644	1,683	1,641	1,685
Contingently convertible debt common stock equivalents	1	1	1	1
Incremental shares attributable to share-based compensation plans	15	17	16	18
Weighted-average common shares outstanding - diluted	1,660	1,701	1,658	1,704
Earnings per share - diluted	$ 0.32	$ 0.38	$ 0.69	$ 1.02
Anti-dilutive weighted-average equivalent shares - stock incentive plans				3

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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