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Inventories (Tables)
 9 Months Ended
Sep. 30, 2020
Inventory Disclosure [Abstract]  
Summary of Inventories Inventories consisted of the following:
As of
September 30, 2020December 31, 2019
Parts and work-in-process
$119 $153 
Finished goods
104 91 
Total inventories
$223 $244