Consolidated Statement of Income - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Income Statement [Abstract]
Net sales	$ 8,829	$ 8,851
Operating expenses
Cost of sales	4,826	4,525
Selling, general and administrative expenses	1,882	1,808
Research, development and related expenses	480	524
Total operating expenses	7,188	6,857
Operating income	1,641	1,994
Other expense (income), net	38	49
Income before income taxes	1,603	1,945
Provision for income taxes	302	319
Income of consolidated group	1,301	1,626
Income (loss) from unconsolidated subsidiaries, net of taxes	2	1
Net income including noncontrolling interest	1,303	1,627
Less: Net income (loss) attributable to noncontrolling interest	4	3
Net income attributable to 3M	$ 1,299	$ 1,624
Weighted average 3M common shares outstanding - basic (in shares)	572.3	580.5
Earnings per share attributable to 3M common shareholders - basic (in dollars per share)	$ 2.27	$ 2.80
Weighted average 3M common shares outstanding - diluted (in shares)	575.0	586.3
Earnings per share attributable to 3M common shareholders - diluted (in dollars per share)	$ 2.26	$ 2.77