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Inventories
 9 Months Ended
Sep. 30, 2018
Inventory Disclosure [Abstract]  
Inventories
Inventories

Finished goods primarily represents crude oil, caustic soda and vinyl products. Inventories as of September 30, 2018, and December 31, 2017, consisted of the following (in millions):
 
 
2018
 
2017
 
 
 
 
 
 
 
Raw materials
 
$
69

 
$
66

 
Materials and supplies
 
434

 
447

 
Finished goods
 
549

 
776

 
 
 
1,052

 
1,289

 
Revaluation to LIFO
 
(43
)
 
(43
)
 
Total
 
$
1,009

 
$
1,246