Earnings Per Share

12 Months Ended

Dec. 31, 2011

Earnings Per Share [Abstract]

Earnings Per Share

(16)  Earnings Per Share

Basic earnings per share is computed by dividing net income by the weighted average shares outstanding during the year. The computation of diluted earnings per share reflects the potential dilutive effect, using the treasury stock method, of outstanding awards under stock-based employee compensation plans.

The following table sets forth the computation of basic and diluted earnings per share:

	Years Ended December 31
	2011		2010		2009
	(in millions except for per
	share amounts)
Basic earnings per share:
Net income	$	1,678	$	2,174	$	2,183
Weighted average shares outstanding		289.3		319.2		350.1
Basic earnings per share	$	5.80	$	6.81	$	6.24
Diluted earnings per share:
Net income	$	1,678	$	2,174	$	2,183
Weighted average shares outstanding		289.3		319.2		350.1
Additional shares from assumed issuance of shares under stock-based compensation awards		2.1		2.4		2.9
Weighted average shares and potential shares assumed outstanding for computing diluted earnings per share		291.4		321.6		353.0
Diluted earnings per share	$	5.76	$	6.76	$	6.18