Consolidated Statement of Income (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Net sales	$ 8,134	$ 7,752	$ 15,965	$ 15,386
Operating expenses
Cost of sales	4,184	4,013	8,215	7,982
Selling, general and administrative expenses	1,646	1,610	3,278	3,199
Research, development and related expenses	448	427	900	857
Total operating expenses	6,278	6,050	12,393	12,038
Operating income	1,856	1,702	3,572	3,348
Interest expense and income
Interest expense	45	41	82	80
Interest income	(9)	(10)	(18)	(20)
Total interest expense - net	36	31	64	60
Income before income taxes	1,820	1,671	3,508	3,288
Provision for income taxes	537	458	1,000	928
Net income including noncontrolling interest	1,283	1,213	2,508	2,360
Less: Net income attributable to noncontrolling interest	16	16	34	34
Net income attributable to 3M	$ 1,267	$ 1,197	$ 2,474	$ 2,326
Weighted average 3M common shares outstanding - basic (in shares)	652.0	688.2	656.7	689.6
Earnings per share attributable to 3M common shareholders - basic (in dollars per share)	$ 1.94	$ 1.74	$ 3.77	$ 3.37
Weighted average 3M common shares outstanding - diluted (in shares)	664.6	699.1	669.6	700.6
Earnings per share attributable to 3M common shareholders - diluted (in dollars per share)	$ 1.91	$ 1.71	$ 3.70	$ 3.32
Cash dividends paid per 3M common share (in dollars per share)	$ 0.855	$ 0.635	$ 1.71	$ 1.27