Stock-Based Compensation (Details 3) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013 Stock Option Program	Mar. 31, 2012 Stock Option Program	Mar. 31, 2013 Stock Option Program Annual Stock Option Program	Mar. 31, 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)	91,690
Exercised	(9,059,296)
Canceled	(40,064)
Balance at the end of the period	53,778,170
Weighted average exercise price - Beginning balance	$ 80.33
Weighted average exercise price - Granted - Annual	$ 101.55
Weighted average exercise price - Granted - Progressive (Reload)	$ 102.45
Weighted average exercise price - Exercised	$ 77.46
Weighted average exercise price - Canceled	$ 87.37
Weighted average exercise price - Ending balance	$ 83.29
Options exercisable	41,708,894
Options exercisable, exercise price	$ 79.83
Weighted average remaining contractual life for options outstanding	64 months
Aggregate intrinsic value for options outstanding	$ 1,238
Weighted average remaining contractual life for options exercisable	51 months
Aggregate intrinsic value for options exercisable	1,105
Compensation expense yet to be recognized	94
Weighted average life of remaining vesting period	25 months
Total intrinsic value of stock options exercised	215	67
Cash received from options exercised	702	179
Tax benefit realized from exercise of stock options	$ 80	$ 25
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				38,205,266