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Goodwill (Tables)
 9 Months Ended
Sep. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill [Table Text Block]
The gross carrying amounts and changes in the carrying amount of goodwill for the nine months ended September 30, 2018 were as follows:
 
 
Olefins Segment
 
Vinyls Segment
 
Total
Balances at December 31, 2017
 
$
30

 
$
982

 
$
1,012

Effects of changes in foreign exchange rates
 
—

 
(4
)
 
(4
)
Balances at September 30, 2018
 
$
30

 
$
978

 
$
1,008