Inventories (Tables)

9 Months Ended

Sep. 30, 2021

Inventory Disclosure [Abstract]

Summary of Inventories

Inventories consisted of the following:

	As of
	September 30, 2021		December 31, 2020
Parts and work-in-process	$	69	$	86
Finished goods	36		33
Total inventories	$	105	$	119