Earnings (Loss) Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended	12 Months Ended
Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Earnings Per Share [Abstract]
Options outstanding not included in computation of diluted earnings per share (in shares)									30.8	36.1	30.3
Numerator:
Net income (loss) from continuing operations attributable to 3M	$ 728	$ 1,372	$ 1,204	$ 705	$ 634	$ (2,527)	$ (7,171)	$ 662	$ 4,009	$ (8,402)	$ 4,013
Net income (loss) from discontinued operations, net of taxes	0	0	(59)	223	311	452	330	314	164	1,407	1,764
Net income (loss) attributable to 3M	$ 728	$ 1,372	$ 1,145	$ 928	$ 945	$ (2,075)	$ (6,841)	$ 976	$ 4,173	$ (6,995)	$ 5,777
Denominator:
Denominator for weighted average 3M common shares outstanding - basic (in shares)									550.8	553.9	566.0
Dilution associated with stock-based compensation plans (in shares)									1.6	0.0	1.6
Denominator for weighted average 3M common shares outstanding – diluted (in shares)									552.4	553.9	567.6
Earnings (loss) per share from continuing operations — basic (in dollars per share)	$ 1.34	$ 2.49	$ 2.17	$ 1.27	$ 1.14	$ (4.56)	$ (12.94)	$ 1.20	$ 7.28	$ (15.17)	$ 7.09
Earnings (loss) per share from discontinued operations — basic (in dollars per share)	0	0	(0.10)	0.40	0.56	0.82	0.59	0.57	0.30	2.54	3.12
Earnings (loss) per share — basic (in dollars per share)	1.34	2.49	2.07	1.67	1.70	(3.74)	(12.35)	1.77	7.58	(12.63)	10.21
Earnings (loss) per share from continuing operations — diluted (in dollars per share)	1.33	2.48	2.17	1.27	1.14	(4.56)	(12.94)	1.20	7.26	(15.17)	7.07
Earnings (loss) per share from discontinued operations — diluted (in dollars per share)	0	0	(0.10)	0.40	0.56	0.82	0.59	0.56	0.29	2.54	3.11
Earnings (loss) per share — diluted (in dollars per share)	$ 1.33	$ 2.48	$ 2.07	$ 1.67	$ 1.70	$ (3.74)	$ (12.35)	$ 1.76	$ 7.55	$ (12.63)	$ 10.18

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 260
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482662/260-10-50-1