Stock-Based Compensation (Details 2) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Share- based compensation assumptions
Stock-based compensation programs expense	$ 122	$ 103
Stock Option Program
Stock Option Program
Balance at the beginning of the period	43,938,778
Granted - Annual	5,736,183
Exercised	(2,758,156)
Canceled	(59,359)
Balance at the end of the period	46,857,446
Weighted average exercise price - Beginning balance	$ 83.84
Weighted average exercise price - Granted - Annual	$ 126.77
Weighted average exercise price - Exercised	$ 83.04
Weighted average exercise price - Canceled	$ 108.64
Weighted average exercise price - Ending balance	$ 89.11
Expiration of annual grants	10 years
Options exercisable	34,939,677
Options exercisable, exercise price	$ 81.51
Weighted average remaining contractual life for options outstanding	67 months
Aggregate intrinsic value for options outstanding	2,181
Weighted average remaining contractual life for options exercisable	53 months
Aggregate intrinsic value for options exercisable	1,892
Compensation expense yet to be recognized	106
Weighted average life of remaining vesting period	26 months
Total intrinsic value of stock options exercised	143	215
Cash received from options exercised	229	702
Tax benefit realized from exercise of stock options	$ 52	$ 80
Stock Option Program | Maximum
Stock Option Program
Vesting period	3 years
Stock Option Program | Minimum
Stock Option Program
Vesting period	1 year
Stock Option Program | Annual Stock Option Program
Share- based compensation assumptions
Weighted average exercise price	$ 126.72
Risk-free interest rate (as a percent)	1.90%
Dividend yield (as a percent)	2.60%
Expected volatility (as a percent)	20.80%
Expected life	75 months
Black-Scholes fair value	$ 19.63
3M Long Term Incentive Plan
Share- based compensation assumptions
Number of shares authorized	100,000,000
Number of shares available for grant under the 2008 Long Term Incentive Plan Program (including additional subsequent shareholder approvals)	28,973,064