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Inventories (Tables)
6 Months Ended
Jun. 30, 2019
Inventory, Gross [Abstract]  
Components of Inventories
 
June 30, 2019
 
December 31, 2018
Raw materials and supplies
$
953

 
$
937

Work in process
178

 
144

Finished goods
706

 
609

 
$
1,837

 
$
1,690