Consolidated Statement of Income (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
Net sales	$ 7,752	$ 7,534	$ 15,386	$ 15,020
Operating expenses
Cost of sales	4,013	3,870	7,982	7,759
Selling, general and administrative expenses	1,610	1,528	3,199	3,080
Research, development and related expenses	427	408	857	819
Total operating expenses	6,050	5,806	12,038	11,658
Operating income	1,702	1,728	3,348	3,362
Interest expense and income
Interest expense	41	43	80	83
Interest income	(10)	(10)	(20)	(19)
Total interest expense - net	31	33	60	64
Income before income taxes	1,671	1,695	3,288	3,298
Provision for income taxes	458	509	928	971
Net income including noncontrolling interest	1,213	1,186	2,360	2,327
Less: Net income attributable to noncontrolling interest	16	19	34	35
Net income attributable to 3M	$ 1,197	$ 1,167	$ 2,326	$ 2,292
Weighted average 3M common shares outstanding - basic (in shares)	688.2	694.3	689.6	695.5
Earnings per share attributable to 3M common shareholders - basic (in dollars per share)	$ 1.74	$ 1.68	$ 3.37	$ 3.30
Weighted average 3M common shares outstanding - diluted (in shares)	699.1	702.6	700.6	704.4
Earnings per share attributable to 3M common shareholders - diluted (in dollars per share)	$ 1.71	$ 1.66	$ 3.32	$ 3.25
Cash dividends paid per 3M common share (in dollars per share)	$ 0.635	$ 0.59	$ 1.27	$ 1.18