Consolidated Statement of Income - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Income Statement [Abstract]
Net sales	$ 8,702	$ 8,950	$ 17,531	$ 17,801
Operating expenses
Cost of sales	5,093	4,719	9,919	9,244
Selling, general and administrative expenses	3,023	1,746	4,905	3,554
Research, development and related expenses	476	514	956	1,038
Total operating expenses	8,592	6,979	15,780	13,836
Operating income	110	1,971	1,751	3,965
Other expense (income), net	50	33	88	82
Income before income taxes	60	1,938	1,663	3,883
Provision for income taxes	(23)	415	279	734
Income of consolidated group	83	1,523	1,384	3,149
Income (loss) from unconsolidated subsidiaries, net of taxes	(1)	2	1	3
Net income including noncontrolling interest	82	1,525	1,385	3,152
Less: Net income (loss) attributable to noncontrolling interest	4	1	8	4
Net income attributable to 3M	$ 78	$ 1,524	$ 1,377	$ 3,148
Weighted average 3M common shares outstanding - basic (in shares)	571.0	581.0	571.6	580.7
Earnings per share attributable to 3M common shareholders - basic (in dollars per share)	$ 0.14	$ 2.62	$ 2.41	$ 5.42
Weighted average 3M common shares outstanding - diluted (in shares)	572.7	588.6	573.8	587.4
Earnings per share attributable to 3M common shareholders - diluted (in dollars per share)	$ 0.14	$ 2.59	$ 2.40	$ 5.36