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Inventories (Tables)
6 Months Ended
Jun. 30, 2019
Inventory Disclosure [Abstract]  
Summary of Inventories
Inventories consisted of the following as of the dates presented below:
 
 
June 30, 2019
 
December 31, 2018
Parts and work-in-process
 
$
146

 
$
131

Finished goods
 
92

 
85

Total inventories
 
$
238

 
$
216