Stock-Based Compensation (Details 3) (Stock Option Program, USD $) In Millions, except Share data, unless otherwise specified	9 Months Ended
	Sep. 30, 2011 M Y	Sep. 30, 2010
Stock Option Program
Balance at the beginning of the period	70,335,044
Granted - Annual	5,514,500
Granted - Progressive (Reload)	234,639
Granted - Other	5,667
Exercised	(11,408,114)
Canceled	(281,801)
Balance at the end of the period	64,399,935
Weighted average exercise price - Beginning balance	$ 74.80
Weighted average exercise price - Annual grants	$ 89.46
Weighted average exercise price - Progressive (Reload)	$ 94.21
Weighted average exercise price - Other	$ 90.42
Weighted average exercise price - Exercised	$ 68.55
Weighted average exercise price - Canceled	$ 74.24
Weighted average exercise price - Ending balance	$ 77.24
Options exercisable	52,765,533
Options exercisable, exercise price	$ 76.81
Weighted Average Remaining Contractual Life for options outstanding (in months)	57
Aggregate Intrinsic Value for options outstanding	$ 192
Weighted Average Remaining Contractual Life for options exercisable (in months)	47
Aggregate Intrinsic Value for options exercisable	152
Compensation expense yet to be recognized for stock options	71
Weighted average life of remaining vesting period for stock options (in years)	1.8
Total intrinsic value of stock options exercised	283	214
Cash received from options exercised	782	433
Tax benefit realized from exercise of stock options	$ 86	$ 63
Annual
Share- based compensation assumptions
Weighted average exercise price	$ 89.47
Risk-free interest rate (as a percent)	2.80%
Dividend yield (as a percent)	2.60%
Expected volatility (as a percent)	22.00%
Expected life (in months)	72
Black-Scholes fair value	$ 16.10