Consolidated Statement of Income (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Income Statement [Abstract]
Net sales	$ 6,500	$ 6,344	$ 12,530	$ 12,298
Operating expenses
Cost of sales	3,817	3,646	7,391	7,124
Selling, general and administrative expenses	1,061	1,267	1,805	2,212
Research, development and related expenses	302	288	610	573
Loss on business divestitures	336	3	343	3
Total operating expenses	5,516	5,204	10,149	9,912
Operating income	984	1,140	2,381	2,386
Other expense (income), net	(136)	217	383	78
Income before income taxes	1,120	923	1,998	2,308
Provision for income taxes	183	245	404	510
Income of consolidated group	937	678	1,594	1,798
Income from unconsolidated subsidiaries, net of taxes	1	47	3	49
Net income including noncontrolling interest	938	725	1,597	1,847
Less: net income attributable to noncontrolling interest	5	2	11	8
Net income attributable to 3M	$ 933	$ 723	$ 1,586	$ 1,839
Earnings per share attributable to 3M common shareholders:
Weighted average 3M common shares outstanding — basic (in shares)	519.7	537.4	524.4	540.6
Earnings per share — basic (in dollars per share)	$ 1.79	$ 1.35	$ 3.02	$ 3.40
Weighted average 3M common shares outstanding — diluted (in shares)	522.4	540.6	527.6	544.2
Earnings per share — diluted (in dollars per share)	$ 1.78	$ 1.34	$ 3.01	$ 3.38

Consolidated Statement of Cash Flows (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025	Dec. 31, 2025
Cash flows from operating activities
Net income including noncontrolling interest	$ 938	$ 725	$ 1,597	$ 1,847
Adjustments to reconcile net income including noncontrolling interest to net cash provided by (used in) operating activities
Depreciation and amortization			661	580
Company pension and postretirement contributions			(73)	(61)
Company pension and postretirement expense			73	135
Stock-based compensation expense			121	129
Loss on business divestitures	336	3	343	3
Deferred income taxes			120	217
Changes in assets and liabilities
Accounts receivable			(414)	(419)
Inventories			(132)	(240)
Accounts payable			421	182
Other — net			(1,157)	(3,406)
Net cash provided by (used in) operating activities			1,560	(1,033)
Cash flows from investing activities
Purchases of property, plant and equipment (PP&E)			(448)	(444)
Proceeds from sale of PP&E and other assets			14	21
Purchases of marketable securities and investments			(294)	(419)
Proceeds from maturities and sale of marketable securities and investments			622	2,130
Proceeds from (payments for) sale of businesses, net of cash sold			(326)	5
Other — net			9	(3)
Net cash provided by (used in) investing activities			(423)	1,290
Cash flows from financing activities
Repayment of debt (maturities greater than 90 days)			0	(1,250)
Proceeds from debt (maturities greater than 90 days)			0	1,099
Purchases of treasury stock			(2,993)	(2,227)
Proceeds from issuance of treasury stock pursuant to stock option and benefit plans			364	988
Dividends paid to shareholders			(813)	(786)
Other — net			(16)	(15)
Net cash provided by (used in) financing activities			(3,458)	(2,191)
Effect of exchange rate changes on cash and cash equivalents			(5)	46
Net increase (decrease) in cash and cash equivalents, including cash classified within assets held for sale			(2,326)	(1,888)
Less: net increase (decrease) in cash classified within assets held for sale			(46)	0
Net increase (decrease) in cash and cash equivalents			(2,280)	(1,888)
Cash and cash equivalents at beginning of year			5,235	5,600	$ 5,600
Cash and cash equivalents at end of period	$ 2,955	$ 3,712	$ 2,955	$ 3,712	$ 5,235

Consolidated Balance Sheet (Unaudited) - USD ($) $ in Millions	Jun. 30, 2026	Dec. 31, 2025
Current assets
Cash and cash equivalents	$ 2,955	$ 5,235
Marketable securities	375	698
Accounts receivable — net of allowances of $51 and $61	3,927	3,533
Inventories	3,770	3,661
Prepaids	492	391
Assets held for sale	0	46
Other current assets	2,593	2,823
Total current assets	14,112	16,387
Property, plant and equipment — net	6,877	7,101
Goodwill	6,374	6,419
Intangible assets — net	1,053	1,103
Other assets	6,508	6,723
Total assets	34,924	37,733
Current liabilities
Short-term borrowings and current portion of long-term debt	1,647	1,670
Accounts payable	3,108	2,702
Accrued payroll	522	718
Liabilities held for sale	0	55
Other current liabilities	6,102	4,450
Total current liabilities	11,379	9,595
Long-term debt	10,904	10,932
Pension and postretirement benefits	1,502	1,631
Other liabilities	8,134	10,828
Total liabilities	31,919	32,986
Commitments and contingencies (Note 15)
3M Company shareholders’ equity:
Common stock	9	9
Additional paid-in capital	7,540	7,440
Retained earnings	38,633	38,258
Treasury stock, at cost	(38,177)	(35,936)
Accumulated other comprehensive income (loss)	(5,053)	(5,069)
Total 3M Company shareholders’ equity	2,952	4,702
Noncontrolling interest	53	45
Total equity	3,005	4,747
Total liabilities and equity	$ 34,924	$ 37,733