Common Stock (Tables)

12 Months Ended

Dec. 31, 2011

Common Stock [Abstract]

Assumptions used in the pricing model and the weighted average grant-date fair value of stock options granted

Year Ended December 31	2011			2010			2009
Expected volatility		17.5	%		17.4	%		15.6%
Expected term (in years)		5.0			5.0			5.0
Interest rate		2.3	%		2.4	%		1.9%
Dividend yield		4.8	%		5.6	%		5.4%
Weighted average grant-date fair value	$	3.23		$	2.23		$	1.80

Summary of company's activity in the stock option plan 2011

	Shares Subject  To Option	Weighted Average     Exercise Price
Outstanding at December 31, 2010	50,711,586	$32.48
Granted	7,100,503	38.13
Exercised	(16,800,778)	31.44
Cancelled	(54,489)	33.43
Outstanding at December 31, 2011	40,956,822	$33.88
Exercisable at December 31, 2011	26,539,300	$33.54

Earnings per share

	Average Common Stock Shares
	2011		2010		2009
	(in millions)
As reported shares		857		832		795
Effect of options		7		5		1
Diluted shares		864		837		796