Stock-Based Compensation (Details 3) (Stock Option Program, USD $) In Millions, except Share data, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Stock Option Program
Balance at the beginning of the period	64,148,415
Granted - Annual	5,770,190
Granted - Progressive (Reload)	106,807
Granted - Other	1,238
Exercised	(10,205,938)
Canceled	(363,183)
Balance at the end of the period	59,457,529
Weighted average exercise price - Beginning balance	$ 77.28
Weighted average exercise price - Granted - Annual	$ 87.91
Weighted average exercise price - Granted - Progressive (Reload)	$ 89.52
Weighted average exercise price - Granted - Other	$ 89.45
Weighted average exercise price - Exercised	$ 67.33
Weighted average exercise price - Canceled	$ 83.42
Weighted average exercise price - Ending balance	$ 80.01
Options exercisable	48,076,370
Options exercisable, exercise price	$ 78.47
Weighted average remaining contractual life for options outstanding	57 months
Aggregate intrinsic value for options outstanding	$ 739
Weighted average remaining contractual life for options exercisable	46 months
Aggregate intrinsic value for options exercisable	671
Compensation expense yet to be recognized	67
Weighted average life of remaining vesting period	22 months
Total intrinsic value of stock options exercised	225	283
Cash received from options exercised	687	782
Tax benefit realized from exercise of stock options	$ 84	$ 86
Annual Stock Option Program
Share- based compensation assumptions
Weighted average exercise price	$ 87.89
Risk-free interest rate (as a percent)	1.10%
Dividend yield (as a percent)	2.60%
Expected volatility (as a percent)	24.50%
Expected life	74 months
Black-Scholes fair value	$ 14.94