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Net Earnings Per Share (Tables)
 9 Months Ended
Sep. 30, 2017
Earnings Per Share [Abstract]  
Summary of net earnings per share
Net (loss) earnings per share were computed as follows:
 
Three months ended 
 September 30,
 
Nine months ended 
 September 30,
 
2017
 
2016
 
2017
 
2016
 
(in millions, except per share amounts)
Net (loss) earnings attributable to common stockholders
$
(87
)
 
$
(30
)
 
$
(107
)
 
$
43

Basic earnings per common share:
 

 
 

 
 

 
 

Weighted-average common shares outstanding
233.2

 
233.1

 
233.2

 
233.2

Net (loss) earnings attributable to common stockholders
$
(0.37
)
 
$
(0.13
)
 
$
(0.46
)
 
$
0.19

Diluted earnings per common share:
 

 
 

 
 

 
 

Weighted-average common shares outstanding
233.2

 
233.1

 
233.2

 
233.2

Dilutive common shares—stock options
—

 
—

 
—

 
0.3

Diluted weighted-average shares outstanding
233.2

 
233.1

 
233.2

 
233.5

Net (loss) earnings attributable to common stockholders
$
(0.37
)
 
$
(0.13
)
 
$
(0.46
)
 
$
0.19