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Earnings per Share (Tables)
 9 Months Ended
Sep. 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
September 30,
 
Nine Months Ended 
 September 30,
In millions, except per share amounts
2016
 
2015
 
2016
 
2015
Net income (loss) attributable to common stockholders
$
49

 
$
78

 
$
67

 
$
(165
)
Weighted average outstanding shares of common stock
129.7

 
139.2

 
129.6

 
142.1

Dilutive effect of employee stock options, restricted stock and other stock awards
1.9

 
2.2

 
1.7

 
—

Common stock and common stock equivalents
131.6

 
141.4

 
131.3

 
142.1

Income (loss) per share:
 
 
 
 
 
 
 
Basic
$
0.38

 
$
0.56

 
$
0.52

 
$
(1.16
)
Diluted
$
0.37

 
$
0.55

 
$
0.51

 
$
(1.16
)