Consolidated Statement of Income (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Net sales	$ 8,137	$ 7,916	$ 24,102	$ 23,302
Operating expenses
Cost of sales	4,205	4,148	12,420	12,130
Selling, general and administrative expenses	1,597	1,609	4,875	4,808
Research, development and related expenses	434	420	1,334	1,277
Total operating expenses	6,236	6,177	18,629	18,215
Operating income	1,901	1,739	5,473	5,087
Interest expense and income
Interest expense	28	33	110	113
Interest income	(7)	(10)	(25)	(30)
Total interest expense - net	21	23	85	83
Income before income taxes	1,880	1,716	5,388	5,004
Provision for income taxes	569	471	1,569	1,399
Net income including noncontrolling interest	1,311	1,245	3,819	3,605
Less: Net income attributable to noncontrolling interest	8	15	42	49
Net income attributable to 3M	$ 1,303	$ 1,230	$ 3,777	$ 3,556
Weighted average 3M common shares outstanding - basic (in shares)	645.3	679.8	652.9	686.4
Earnings per share attributable to 3M common shareholders - basic (in dollars per share)	$ 2.02	$ 1.81	$ 5.78	$ 5.18
Weighted average 3M common shares outstanding - diluted (in shares)	657.9	691.8	665.7	697.7
Earnings per share attributable to 3M common shareholders - diluted (in dollars per share)	$ 1.98	$ 1.78	$ 5.67	$ 5.10
Cash dividends paid per 3M common share (in dollars per share)	$ 0.855	$ 0.635	$ 2.565	$ 1.905