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Inventories (Tables)
9 Months Ended
Sep. 30, 2019
Inventory Disclosure [Abstract]  
Summary of Inventories
Inventories consisted of the following as of the dates presented below:
 
September 30, 2019
 
December 31, 2018
Parts and work-in-process
$
154

 
$
131

Finished goods
103

 
85

Total inventories
$
257

 
$
216