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Stock-Based Compensation (Details 3) (USD $)
In Millions, except Share data, unless otherwise specified
9 Months Ended
Sep. 30, 2013
Stock Option Program
Sep. 30, 2012
Stock Option Program
Sep. 30, 2013
Stock Option Program
Maximum
Sep. 30, 2013
Stock Option Program
Minimum
Sep. 30, 2013
Stock Option Program
Annual Stock Option Program
Sep. 30, 2013
3M Long Term Incentive Plan
May 31, 2012
3M Long Term Incentive Plan
Stock Option Program              
Balance at the beginning of the period 56,565,030            
Granted - Annual 6,220,810            
Granted - Progressive (Reload) 96,770            
Exercised (16,270,094)            
Canceled (144,488)            
Balance at the end of the period 46,468,028            
Weighted average exercise price - Beginning balance $ 80.33            
Weighted average exercise price - Granted - Annual $ 101.55            
Weighted average exercise price - Granted - Progressive (Reload) $ 102.86            
Weighted average exercise price - Exercised $ 78.76            
Weighted average exercise price - Canceled $ 89.23            
Weighted average exercise price - Ending balance $ 83.73            
Options exercisable 34,588,636            
Options exercisable, exercise price $ 79.78            
Weighted average remaining contractual life for options outstanding 63 months            
Aggregate intrinsic value for options outstanding $ 1,658            
Weighted average remaining contractual life for options exercisable 49 months            
Aggregate intrinsic value for options exercisable 1,371            
Compensation expense yet to be recognized 64            
Weighted average life of remaining vesting period 22 months            
Total intrinsic value of stock options exercised 444 225          
Cash received from options exercised 1,282 687          
Tax benefit realized from exercise of stock options $ 164 $ 84          
Share- based compensation assumptions              
Weighted average exercise price         $ 101.49    
Risk-free interest rate (as a percent)         1.20%    
Dividend yield (as a percent)         2.70%    
Expected volatility (as a percent)         20.00%    
Expected life         75 months    
Black-Scholes fair value         $ 13.46    
Number of shares authorized             100,000,000
Number of shares available for grant under the 2008 Long Term Incentive Plan Program           38,329,965  
Vesting period     3 years 1 year      
Expiration of annual grants 10 years