Stock-Based Compensation (Details 3) (Stock Option Program, USD $) In Millions, except Share data, unless otherwise specified	6 Months Ended
	Jun. 30, 2012 M Y	Jun. 30, 2011
Stock Option Program
Balance at the beginning of the period	64,148,415
Granted - Annual	5,770,190
Granted - Progressive (Reload)	74,211
Granted - Other	653
Exercised	(6,449,565)
Canceled	(299,879)
Balance at the end of the period	63,244,025
Weighted average exercise price - Beginning balance	$ 77.28
Weighted average exercise price - Granted - Annual	$ 87.91
Weighted average exercise price - Granted - Progressive (Reload)	$ 88.16
Weighted average exercise price - Granted - Other	$ 89.60
Weighted average exercise price - Exercised	$ 65.08
Weighted average exercise price - Canceled	$ 82.65
Weighted average exercise price - Ending balance	$ 79.48
Options exercisable	51,829,163
Options exercisable, exercise price	$ 77.94
Weighted average remaining contractual life for options outstanding (in months)	58
Aggregate intrinsic value for options outstanding	$ 641
Weighted average remaining contractual life for options exercisable (in months)	47
Aggregate intrinsic value for options exercisable	605
Compensation expense yet to be recognized for stock options	82
Weighted average life of remaining vesting period (in years)	2
Total intrinsic value of stock options exercised	147	256
Cash received from options exercised	420	694
Tax benefit realized from exercise of stock options	$ 55	$ 74
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 (in months)	74
Black-Scholes fair value	$ 14.94