Earnings Per Share (Tables)

9 Months Ended

Sep. 30, 2011

Earnings Per Share [Abstract]

Computation of basic and diluted earnings per share

	Periods Ended September 30
	Third Quarter				Nine Months
	2011		2010		2011		2010
	(in millions,
	except for per share amounts)
Basic earnings per share:
Net income	$	298	$	572	$	1,226	$	1,554
Weighted average shares outstanding		285.7		314.4		292.6		323.9
Basic earnings per share	$	1.04	$	1.82	$	4.19	$	4.80
Diluted earnings per share:
Net income	$	298	$	572	$	1,226	$	1,554
Weighted average shares outstanding		285.7		314.4		292.6		323.9
Additional shares from assumed issuance of shares under stock- based compensation awards		2.1		2.9		1.8		2.4
Weighted average shares and potential shares assumed outstanding for computing diluted earnings per share		287.8		317.3		294.4		326.3
Diluted earnings per share	$	1.04	$	1.80	$	4.16	$	4.76