Earnings Per Share (Tables)

12 Months Ended

Dec. 31, 2011

Earnings Per Share [Abstract]

Number of shares used for calculation of basic and diluted earnings per share

	2011		2010		2009
Weighted average common shares outstanding for basic EPS		436		394		310
Effect of dilutive securities - stock plans		2		1		1
Adjusted weighted average common shares outstanding for diluted EPS		438		395		311
Future potentially dilutive shares excluded from diluted EPS:
Options with an exercise price greater than the average market price for the period		3		7		4