Earnings Per Share (Tables)

3 Months Ended

Mar. 31, 2013

Earnings Per Share [Abstract]

Computation of Basic and Diluted Earnings Per Share

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

	Three Months Ended March 31
	2013		2012
	(in millions, except for per share amounts)
Basic earnings per share:
Net income	$	656	$	506
Weighted average shares outstanding		263.3		274.2
Basic earnings per share	$	2.49	$	1.85
Diluted earnings per share:
Net income	$	656	$	506
Weighted average shares outstanding		263.3		274.2
Additional shares from assumed issuance of shares under stock-based compensation awards		1.5		2.0
Weighted average shares and potential shares assumed outstanding for computing diluted earnings per share		264.8		276.2
Diluted earnings per share	$	2.48	$	1.83