Consolidated Statement of Income (USD $) In Millions, except Per Share data	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Net sales	$ 7,531	$ 6,874	$ 22,522	$ 19,953
Operating expenses
Cost of sales	4,027	3,583	11,869	10,256
Selling, general and administrative expenses	1,534	1,361	4,648	4,034
Research, development and related expenses	389	354	1,191	1,046
Total operating expenses	5,950	5,298	17,708	15,336
Operating income	1,581	1,576	4,814	4,617
Interest expense and income
Interest expense	48	51	141	151
Interest income	(10)	(11)	(29)	(27)
Total interest expense (income)	38	40	112	124
Income before income taxes	1,543	1,536	4,702	4,493
Provision for income taxes	440	411	1,319	1,273
Net income including noncontrolling interest	1,103	1,125	3,383	3,220
Less: Net income attributable to noncontrolling interest	15	19	54	63
Net income attributable to 3M	$ 1,088	$ 1,106	$ 3,329	$ 3,157
Weighted average 3M common shares outstanding - basic (in shares)	707.7	714.0	710.9	713.4
Earnings per share attributable to 3M common shareholders - basic (in dollars per share)	$ 1.54	$ 1.55	$ 4.68	$ 4.42
Weighted average 3M common shares outstanding - diluted (in shares)	715.5	725.2	722.8	724.8
Earnings per share attributable to 3M common shareholders - diluted (in dollars per share)	$ 1.52	$ 1.53	$ 4.61	$ 4.36
Cash dividends paid per 3M common share (in dollars per share)	$ 0.55	$ 0.525	$ 1.65	$ 1.575