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Marketable Securities
 6 Months Ended
Jun. 30, 2013
Investments, Debt and Equity Securities [Abstract]  
Marketable Securities
Marketable Securities 
 
June 30, 2013
 
December 31, 2012
 
Cost
 
Unrealized
Gain (Loss)
 
Fair
Value
 
Cost
 
Unrealized
Gain (Loss)
 
Fair
Value
U.S. government securities
$
25

 
$
—

 
$
25

 
$
7

 
$
—

 
$
7

Corporate securities
28

 
(1
)
 
27

 
11

 


 
11

Certificates of deposit
15

 


 
15

 
16

 


 
16

Other
32

 
(2
)
 
30

 
25

 
1

 
26

Total marketable securities
$
100

 
$
(3
)
 
$
97

 
$
59

 
$
1

 
$
60


 
U.S. government securities include bonds issued by government-sponsored agencies and Treasury notes. Corporate securities include both debt and equity 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 total $16, $48 and $3 at June 30, 2013.