Inventories (Tables)

3 Months Ended

Mar. 31, 2019

Inventory Disclosure [Abstract]

Summary of Inventories

Inventories consisted of the following as of the dates presented below:

	March 31, 2019		December 31, 2018
Parts and work-in-process	$	139	$	131
Finished goods	90		85
Total inventories	$	229	$	216