Consolidated Statement of Income - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Consolidated Statement of Income
Net sales	$ 7,662	$ 7,686	$ 15,071	$ 15,264
Operating expenses
Cost of sales	3,799	3,858	7,477	7,679
Selling, general and administrative expenses	1,560	1,550	3,053	3,114
Research, development and related expenses	437	438	887	901
Total operating expenses	5,796	5,846	11,417	11,694
Operating income	1,866	1,840	3,654	3,570
Interest expense and income
Interest expense	38	35	85	66
Interest income	(7)	(7)	(12)	(11)
Total interest expense - net	31	28	73	55
Income before income taxes	1,835	1,812	3,581	3,515
Provision for income taxes	542	509	1,010	1,011
Net income including noncontrolling interest	1,293	1,303	2,571	2,504
Less: Net income attributable to noncontrolling interest	2	3	5	5
Net income attributable to 3M	$ 1,291	$ 1,300	$ 2,566	$ 2,499
Weighted average 3M common shares outstanding - basic (in shares)	606.9	631.3	607.2	633.8
Earnings per share attributable to 3M common shareholders - basic (in dollars per share)	$ 2.13	$ 2.06	$ 4.23	$ 3.94
Weighted average 3M common shares outstanding - diluted (in shares)	620.9	643.0	621.1	646.1
Earnings per share attributable to 3M common shareholders - diluted (in dollars per share)	$ 2.08	$ 2.02	$ 4.13	$ 3.87
Cash dividends paid per 3M common share (in dollars per share)	$ 1.11	$ 1.025	$ 2.22	$ 2.05