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Inventories
3 Months Ended
Mar. 31, 2020
Inventory Disclosure [Abstract]  
Inventories
5. Inventories

At March 31, 2020 and December 31, 2019, inventory consists of the following:
 
March 31, 2020
 
December 31, 2019
Finished goods
$
981

 
$
1,027

Work in process
483

 
460

Raw materials
435

 
408

Materials and supplies
102

 
104

 
$
2,001

 
$
1,999