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Marketable Securities
 9 Months Ended
Sep. 30, 2015
Investments, Debt and Equity Securities [Abstract]  
Marketable Securities
Marketable Securities 
 
September 30, 2015
 
December 31, 2014
 
Cost
 
Unrealized
Gain (Loss)
 
Fair
Value
 
Cost
 
Unrealized
Gain (Loss)
 
Fair
Value
U.S. government securities
$
39

 
$
—

 
$
39

 
$
38

 
$
—

 
$
38

Corporate securities
41

 


 
41

 
36

 


 
36

Certificates of deposit
17

 


 
17

 
23

 


 
23

Other
60

 


 
60

 
67

 
5

 
72

Total marketable securities
$
157

 
$
—

 
$
157

 
$
164

 
$
5

 
$
169


 
U.S. government securities include bonds issued by government-sponsored agencies and Treasury notes. Corporate securities include primarily debt securities. Other consists of investments in mutual and index funds. U.S. government securities, corporate debt and certificates of deposit maturing in one year or less, after one year through five years and after five years through ten years total $40, $55 and $2 at September 30, 2015.