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Marketable Securities
 12 Months Ended
Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract]  
Marketable Securities [Text Block]
Marketable Securities
 
2017
 
2016
 
Cost
 
Unrealized
Gains (Losses)
 
Fair
Value
 
Cost
 
Unrealized
Gains (Losses)
 
Fair
Value
U.S. government securities
$
3

 
$
—

 
$
3

 
$
2

 
$
—

 
$
2

Corporate securities
5

 


 
5

 
2

 


 
2

Certificates of deposit
27

 


 
27

 
22

 
 
 
22

Other
4

 
1

 
5

 
4

 


 
4

Total marketable securities
$
39

 
$
1

 
$
40

 
$
30

 
$
—

 
$
30



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 $27, $5 and $3 at December 31, 2017.