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Earnings per Share (Tables)
 12 Months Ended
Dec. 31, 2017
Earnings Per Share [Abstract]  
Reconciliation of Numerators and Denominators of Earnings Per Share Calculations [Table Text Block]
Reconciliation of the numerators and denominators of the earnings per share calculations —
 
2017
 
2016
 
2015
Income from continuing operations
$
116

 
$
653

 
$
176

Less: Noncontrolling interests net income
10

 
13

 
21

Less: Redeemable noncontrolling interests net loss
(5
)
 


 


Less: Redeemable noncontrolling interests adjustment to redemption value
(6
)
 


 


Income from continuing operations available to common stockholders - Numerator basic and diluted
$
105

 
$
640

 
$
155

 
 
 
 
 
 
Net income available to common stockholders - Numerator basic and diluted
$
105

 
$
640

 
$
159

 
 
 
 
 
 
Denominator:
 
 
 
 
 
Weighted-average shares outstanding - Basic
145.1

 
146.0

 
159.0

Employee compensation-related shares, including stock options
1.8

 
0.8

 
1.0

Weighted-average shares outstanding - Diluted
146.9

 
146.8

 
160.0