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Earnings per Share (Tables)
 6 Months Ended
Jun. 30, 2016
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
June 30,
 
Six Months Ended 
 June 30,
In millions, except per share amounts
2016
 
2015
 
2016
 
2015
Net income (loss) attributable to common stockholders
$
64

 
$
(265
)
 
$
18

 
$
(243
)
Weighted average outstanding shares of common stock
129.8

 
141.9

 
129.6

 
143.6

Dilutive effect of employee stock options, restricted stock and other stock awards
1.7

 
—

 
1.6

 
—

Common stock and common stock equivalents
131.5

 
141.9

 
131.2

 
143.6

Income (loss) per share:
 
 
 
 
 
 
 
Basic
$
0.49

 
$
(1.87
)
 
$
0.14

 
$
(1.69
)
Diluted
$
0.49

 
$
(1.87
)
 
$
0.14

 
$
(1.69
)