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Supplemental Equity and Comprehensive Income Information (Details 6)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2011
USD ($)
Jun. 30, 2010
USD ($)
Mar. 31, 2010
USD ($)
Mar. 31, 2010
JPY (¥)
Jun. 30, 2011
USD ($)
Jun. 30, 2010
USD ($)
Dec. 31, 2009
Sumitomo 3M Limited
USD ($)
Mar. 31, 2010
Sumitomo 3M Limited
Transactions with Sumitomo 3M                
3M's effective ownership before transaction (as a percent)             75.00% 71.50%
3M's effective ownership after transaction (as a percent)             71.50% 75.00%
Increase in noncontrolling interest             $ 81  
Cash paid to acquire additional shares     63 5,800        
Note payable issued to Sumitomo Electric Industries     188 17,400        
Purchase of subsidiary shares including other transfers from noncontrolling interest     278          
Net income attributable to 3M 1,160 1,121     2,241 2,051    
Transfer from noncontrolling interest   24 22     46    
Change in 3M Company shareholders' equity from net income attributable to 3M and transfers from noncontrolling interest   $ 1,145       $ 2,097