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Earnings Per Share
 3 Months Ended
Mar. 31, 2015
Earnings Per Share [Abstract]  
Earnings Per Share
Earnings Per Share
Basic earnings per share is calculated by dividing net income by the weighted average number of shares outstanding during the reported period. The calculation of diluted earnings per share is similar to basic earnings per share, except that the weighted average number of shares outstanding includes the dilution from potential shares resulting from stock options, restricted stock awards and other stock awards.
The components of basic and diluted earnings per share are as follows:
 
Three Months Ended
March 31,
In millions, except per share amounts
2015
 
2014
Net income available for common stockholders
$
22

 
$
59

Weighted average outstanding shares of common stock
145.2

 
158.4

Dilutive effect of employee stock options, restricted stock and other stock awards
2.5

 
2.5

Common stock and common stock equivalents
147.7

 
160.9

Earnings per share:
 
 
 
Basic
$
0.15

 
$
0.37

Diluted
$
0.15

 
$
0.37


Options to purchase 3.1 million and 2.2 million shares of common stock for the three months ended March 31, 2015 and March 31, 2014, respectively were not included in the computation of diluted earnings per share because their exercise prices were greater than the average market price of the common shares for the period, and therefore would have been anti-dilutive.