Consolidated Statement of Income - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Consolidated Statement of Income
Net sales	$ 8,950	$ 7,176	$ 17,801	$ 15,251
Operating expenses
Cost of sales	4,719	3,805	9,244	7,914
Selling, general and administrative expenses	1,746	1,594	3,554	3,362
Research, development and related expenses	514	424	1,038	961
Gain on sale of businesses		(387)		(389)
Total operating expenses	6,979	5,436	13,836	11,848
Operating income	1,971	1,740	3,965	3,403
Other expense (income), net	33	90	82	165
Income before income taxes	1,938	1,650	3,883	3,238
Provision for income taxes	415	347	734	625
Income of consolidated group	1,523	1,303	3,149	2,613
Income (loss) from unconsolidated subsidiaries, net of taxes	2		3
Net income including noncontrolling interest	1,525	1,303	3,152	2,613
Less: Net income (loss) attributable to noncontrolling interest	1	(3)	4	(1)
Net income attributable to 3M	$ 1,524	$ 1,306	$ 3,148	$ 2,614
Weighted average 3M common shares outstanding - basic (in shares)	581.0	577.0	580.7	576.9
Earnings per share attributable to 3M common shareholders - basic (in dollars per share)	$ 2.62	$ 2.26	$ 5.42	$ 4.53
Weighted average 3M common shares outstanding - diluted (in shares)	588.6	580.8	587.4	581.2
Earnings per share attributable to 3M common shareholders - diluted (in dollars per share)	$ 2.59	$ 2.25	$ 5.36	$ 4.50