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Supplemental Equity and Comprehensive Income Information (Details 5) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Effect of noncontrolling interest transactions on equity attributable to 3M Company shareholders
Net income attributable to 3M	$ 1,303	$ 1,230	$ 3,777	$ 3,556
Impact of purchase of subsidiary shares	(408)		(409)
Change in 3M Company shareholder's equity from net income attributable to 3M and impact of purchase of subsidiary shares	$ 895		$ 3,368

This element represents the total net income attributable to the parent for the period and the effect of net changes during the period impacting the parent's ownership interest in a subsidiary as it relates to the total (consolidated) equity attributable to the parent. The changes to the parent's ownership interest in a subsidiary represented by this element did not result in a deconsolidation of the subsidiary from the consolidated financial statements.

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- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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