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Earnings per Share (Tables)
 9 Months Ended
Sep. 30, 2015
Earnings Per Share [Abstract]  
Components of Basic and Diluted Earnings Per Share
The components of basic and diluted earnings per share are as follows:
 
Three Months Ended
September 30,
 
Nine Months Ended 
 September 30,
In millions, except per share amounts
2015
 
2014
 
2015
 
2014
Net income (loss) attributable to common stockholders
$
78

 
$
94

 
$
(165
)
 
$
249

Weighted average outstanding shares of common stock
139.2

 
154.5

 
142.1

 
156.6

Dilutive effect of employee stock options, restricted stock and other stock awards
2.2

 
2.6

 
—

 
2.5

Common stock and common stock equivalents
141.4

 
157.1

 
142.1

 
159.1

Earnings (loss) per share:
 
 
 
 
 
 
 
Basic
$
0.56

 
$
0.61

 
$
(1.16
)
 
$
1.59

Diluted
$
0.55

 
$
0.60

 
$
(1.16
)
 
$
1.57