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Earnings Per Share
 12 Months Ended
Dec. 31, 2012
Earnings Per Share [Abstract]  
Basic and Diluted Earnings Per Share
Earnings Per Share
 
Basic earnings per share of common stock is computed using the weighted average number of shares of common stock outstanding during each period. The diluted earnings per share of common stock include the effect of outstanding stock options, shares of restricted stock, or shares of our common stock held in a rabbi trust (when dilutive). The following table summarizes the calculation of basic and diluted earnings per share: 
 
 
Year Ended December 31,
 
 
2012
 
2011
 
2010
(millions, except per share amounts)
 
 
 
 
 
 
Income from Continuing Operations Used for Diluted Earnings Per Share Calculation
 
$
965

 
$
412

 
$
631

 
 
 
 
 
 
 
Weighted Average Number of Shares Outstanding, Basic
 
178

 
176

 
175

Incremental Shares From Assumed Conversion of Dilutive Stock Options and Restricted Stock
 
2

 
3

 
2

Weighted Average Number of Shares Outstanding, Diluted
 
180

 
179

 
177

Earnings from Continuing Operations Per Share, Basic
 
$
5.43

 
$
2.34

 
$
3.61

Earnings from Continuing Operations Per Share, Diluted
 
5.37

 
2.31

 
3.56

 
 
 
 
 
 
 
Additional Information
 
 
 
 
 
 
Number of antidilutive stock options, shares of restricted stock and shares of common stock in rabbi trust excluded from calculation above
 
3

 
3

 
2

Weighted average option exercise price per share
 
$
97.46

 
$
85.40

 
$
74.01