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Significant Accounting Policies (Tables)
6 Months Ended
Jun. 30, 2012
Significant Accounting Policies  
Earnings per share
Earnings Per Share Computations            
               
    Three months ended Six months ended
    June 30, June 30,
(Amounts in millions, except per share amounts) 2012 2011 2012 2011
Numerator:        
 Net income attributable to 3M  $ 1,167 $ 1,160 $ 2,292 $ 2,241
               
Denominator:            
 Denominator for weighted average 3M common shares             
  outstanding – basic    694.3   713.4   695.5   712.5
               
 Dilution associated with the Company’s stock-based             
  compensation plans    8.3   13.1   8.9   13.9
               
 Denominator for weighted average 3M common shares            
  outstanding – diluted    702.6   726.5   704.4   726.4
               
Earnings per share attributable to 3M common            
 shareholders – basic  $ 1.68 $ 1.63 $ 3.30 $ 3.15
Earnings per share attributable to 3M common            
 shareholders – diluted  $ 1.66 $ 1.60 $ 3.25 $ 3.09