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Inventories (Tables)
3 Months Ended
Mar. 31, 2022
Inventory Disclosure [Abstract]  
Summary of Inventories
Inventories consisted of the following:
As of
March 31, 2022December 31, 2021
Parts and work-in-process
$88 $70 
Finished goods
25 28 
Total inventories
$113 $98