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Inventories
9 Months Ended
Sep. 30, 2020
Inventory Disclosure [Abstract]  
Inventories
5. Inventories

At September 30, 2020 and December 31, 2019, inventory consists of the following:
September 30, 2020December 31, 2019
Finished goods$734 $1,027 
Work in process441 460 
Raw materials400 408 
Materials and supplies103 104 
$1,678 $1,999