Stock-Based Compensation (Details 3) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012 M	Mar. 31, 2011
Stock Option Program
Weighted Average Remaining Contractual Life for options outstanding (in months)	58
Aggregate Intrinsic Value for options outstanding	$ 704
Weighted Average Remaining Contractual Life for options exercisable (in months)	48
Aggregate Intrinsic Value for options exercisable	700
Share- based compensation assumptions
Stock-based compensation programs expense	103	116
Stock Option Program
Stock Option Program
Balance at the beginning of the period	64,148,415
Granted - Annual	5,770,190
Granted - Progressive (Reload)	27,555
Exercised	(2,818,401)
Canceled	(54,173)
Balance at the end of the period	67,073,586
Weighted average exercise price - Beginning balance	$ 77.28
Weighted average exercise price - Annual grants	$ 87.91
Weighted average exercise price - Progressive (Reload)	$ 87.65
Weighted average exercise price - Exercised	$ 63.68
Weighted average exercise price - Canceled	$ 82.53
Weighted average exercise price - Ending balance	$ 78.77
Options exercisable	55,524,130
Options exercisable, exercise price	$ 77.18
Compensation expense yet to be recognized for stock options	98
Weighted average life of remaining vesting period for stock options (in years)	2.1
Total intrinsic value of stock options exercised	67	135
Cash received from options exercised	179	355
Tax benefit realized from exercise of stock options	$ 25	$ 42
Stock Option Program | Annual
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