Consolidated Statement of Income (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Income Statement [Abstract]
Net sales	$ 6,030	$ 5,954
Operating expenses
Cost of sales	3,574	3,478
Selling, general and administrative expenses	744	945
Research, development and related expenses	308	285
Loss on business divestitures	7	0
Total operating expenses	4,633	4,708
Operating income	1,397	1,246
Other expense (income), net	519	(139)
Income before income taxes	878	1,385
Provision for income taxes	221	265
Income of consolidated group	657	1,120
Income from unconsolidated subsidiaries, net of taxes	2	2
Net income including noncontrolling interest	659	1,122
Less: net income attributable to noncontrolling interest	6	6
Net income attributable to 3M	$ 653	$ 1,116
Earnings per share attributable to 3M common shareholders:
Weighted average 3M common shares outstanding — basic (in shares)	529.1	543.8
Earnings per share — basic (in dollars per share)	$ 1.23	$ 2.05
Weighted average 3M common shares outstanding — diluted (in shares)	532.8	547.7
Earnings per share — diluted (in dollars per share)	$ 1.23	$ 2.04