Consolidated Statement of Income - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Net sales	$ 8,171	$ 8,390	$ 16,034	$ 16,668
Operating expenses
Cost of sales	4,313	4,227	8,623	8,463
Selling, general and administrative expenses	1,686	1,800	3,634	4,373
Research, development and related expenses	470	468	947	954
Gain on sale of businesses		(506)	(8)	(530)
Total operating expenses	6,469	5,989	13,196	13,260
Operating income	1,702	2,401	2,838	3,408
Interest expense and income
Other expense (income), net	256	51	304	93
Income before income taxes	1,446	2,350	2,534	3,315
Provision for income taxes	315	488	510	847
Net income including noncontrolling interest	1,131	1,862	2,024	2,468
Less: Net income attributable to noncontrolling interest	4	5	6	9
Net income attributable to 3M	$ 1,127	$ 1,857	$ 2,018	$ 2,459
Weighted average 3M common shares outstanding - basic (in shares)	577.7	591.4	577.6	593.8
Earnings per share attributable to 3M common shareholders - basic (in dollars per share)	$ 1.95	$ 3.14	$ 3.49	$ 4.14
Weighted average 3M common shares outstanding - diluted (in shares)	586.1	604.2	587.3	608.5
Earnings per share attributable to 3M common shareholders - diluted (in dollars per share)	$ 1.92	$ 3.07	$ 3.44	$ 4.04