Earnings Per Share (Tables)

3 Months Ended

Mar. 31, 2013

Earnings Per Share [Abstract]

Reconciliation of basic and diluted earnings per share

The following table reconciles basic and diluted earnings per share of common stock:

(In millions, except per share amounts)	Three Months Ended March 31
Reconciliation of Basic and Diluted Earnings per Share of Common Stock	2013		2012
Weighted average number of basic shares outstanding	418		418
Assumed exercise of dilutive stock options and awards(1)	1		2
Weighted average number of diluted shares outstanding	419		420
Net Income	$	196	$	306
Basic earnings per share of common stock	$	0.47	$	0.73
Diluted earnings per share of common stock	$	0.47	$	0.73

⁽¹⁾  The number of potentially dilutive securities not included in the calculation of diluted shares outstanding due to their antidilutive effect were not significant for the three months ended March 31, 2013 and 2012.