Stockholders' equity

6 Months Ended

Jun. 30, 2011

Stockholders' equity [Abstract]

Stockholders' equity

9. Stockholders’ equity

Stock repurchase program

Activity under our stock repurchase program was as follows (in millions):

	2011				2010
	Shares		Dollars		Shares		Dollars
First quarter		—	$	—		29.1	$	1,684
Second quarter		12.9		732		10.3		616
		12.9	$	732		39.4	$	2,300

In December 2009, the Board of Directors authorized us to repurchase up to $5.0 billion of our common stock and in April 2011, the Board of Directors authorized us to repurchase up to an additional $5.0 billion of our common stock. A total of $6.4 billion remains available as of June 30, 2011.