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Stock-based Compensation (Tables)
 6 Months Ended
Jun. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Stock-based Compensation
The following table summarizes the Company’s stock-based compensation expense for the three and six months ended June 30, 2017 and 2016.
 
Three Months Ended
 
Six Months Ended
 
June 30,
 
June 30,
 
2017
 
2016
 
2017
 
2016
RSUs and PSUs
$
38

 
$
35

 
$
71

 
$
67

Stock options
7

 
7

 
14

 
14

Stock-based compensation expense, before income taxes
45

 
42

 
85

 
81

Related tax benefit
(18
)
 
(16
)
 
(33
)
 
(31
)
Stock-based compensation expense, net of tax benefit
$
27

 
$
26

 
$
52

 
$
50