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Inventories
6 Months Ended
Jun. 30, 2019
Inventory Disclosure [Abstract]  
Inventories
5. Inventories

At June 30, 2019 and December 31, 2018, inventory consists of the following:
 
June 30, 2019
 
December 31, 2018
Finished goods
$
1,110

 
$
1,116

Work in process
497

 
562

Raw materials
489

 
457

Materials and supplies
111

 
110

 
$
2,207

 
$
2,245