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Goodwill (Tables)
 6 Months Ended
Jun. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill [Table Text Block]
 
 
Olefins Segment
 
Vinyls Segment
 
Total
Balances at December 31, 2017
 
$
30

 
$
982

 
$
1,012

Effects of changes in foreign exchange rates
 
—

 
(6
)
 
(6
)
Balances at June 30, 2018
 
$
30

 
$
976

 
$
1,006