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Supplemental Equity and Comprehensive Income Information (Details 5) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Effect of noncontrolling interest transactions on equity attributable to 3M Company shareholders                      
Net income attributable to 3M $ 1,179us-gaap_NetIncomeLoss $ 1,303us-gaap_NetIncomeLoss $ 1,267us-gaap_NetIncomeLoss $ 1,207us-gaap_NetIncomeLoss $ 1,103us-gaap_NetIncomeLoss $ 1,230us-gaap_NetIncomeLoss $ 1,197us-gaap_NetIncomeLoss $ 1,129us-gaap_NetIncomeLoss $ 4,956us-gaap_NetIncomeLoss $ 4,659us-gaap_NetIncomeLoss $ 4,444us-gaap_NetIncomeLoss
Impact of purchase of subsidiary shares                 (409)us-gaap_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangesPurchaseOfInterestByParent    
Change in 3M Company shareholder's equity from net income attributable to 3M and impact of purchase of subsidiary shares                 $ 4,547us-gaap_ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangeDueToNetIncomeAttributableToParentAndEffectsOfChangesNet