Consolidated Statement of Income - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Consolidated Statement of Income
Net sales	$ 8,350	$ 7,991	$ 23,601	$ 24,025
Operating expenses
Cost of sales	4,303	4,188	12,217	12,811
Selling, general and administrative expenses	1,677	1,455	5,039	5,089
Research, development and related expenses	461	443	1,422	1,390
Gain on sale of businesses		(106)	(389)	(114)
Total operating expenses	6,441	5,980	18,289	19,176
Operating income	1,909	2,011	5,312	4,849
Interest expense and income
Other expense (income), net	104	45	311	349
Income before income taxes	1,805	1,966	5,001	4,500
Provision for income taxes	387	378	1,002	888
Income of consolidated group	1,418	1,588	3,999	3,612
Income (loss) from unconsolidated subsidiaries, net of taxes	(1)		(1)
Net income including noncontrolling interest	1,417	1,588	3,998	3,612
Less: Net income (loss) attributable to noncontrolling interest	4	5	3	11
Net income attributable to 3M	$ 1,413	$ 1,583	$ 3,995	$ 3,601
Weighted average 3M common shares outstanding - basic (in shares)	577.8	576.5	577.2	577.2
Earnings per share attributable to 3M common shareholders - basic (in dollars per share)	$ 2.45	$ 2.75	$ 6.92	$ 6.24
Weighted average 3M common shares outstanding - diluted (in shares)	582.4	583.0	581.6	585.9
Earnings per share attributable to 3M common shareholders - diluted (in dollars per share)	$ 2.43	$ 2.72	$ 6.87	$ 6.15