Consolidated Statement of Income (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Net sales	$ 7,916	$ 7,497	$ 23,302	$ 22,517
Operating expenses
Cost of sales	4,148	3,935	12,130	11,694
Selling, general and administrative expenses	1,609	1,487	4,808	4,567
Research, development and related expenses	420	397	1,277	1,216
Total operating expenses	6,177	5,819	18,215	17,477
Operating income	1,739	1,678	5,087	5,040
Interest expense and income
Interest expense	33	44	113	127
Interest income	(10)	(10)	(30)	(29)
Total interest expense - net	23	34	83	98
Income before income taxes	1,716	1,644	5,004	4,942
Provision for income taxes	471	464	1,399	1,435
Net income including noncontrolling interest	1,245	1,180	3,605	3,507
Less: Net income attributable to noncontrolling interest	15	19	49	54
Net income attributable to 3M	$ 1,230	$ 1,161	$ 3,556	$ 3,453
Weighted average 3M common shares outstanding - basic (in shares)	679.8	693.0	686.4	694.7
Earnings per share attributable to 3M common shareholders - basic (in dollars per share)	$ 1.81	$ 1.68	$ 5.18	$ 4.97
Weighted average 3M common shares outstanding - diluted (in shares)	691.8	703.1	697.7	703.9
Earnings per share attributable to 3M common shareholders - diluted (in dollars per share)	$ 1.78	$ 1.65	$ 5.10	$ 4.91
Cash dividends paid per 3M common share (in dollars per share)	$ 0.635	$ 0.59	$ 1.905	$ 1.77