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Business Combinations - Additional Information (Details)
$ in Millions
Sep. 30, 2018
USD ($)
Nov. 01, 2017
USD ($)
expert
Dec. 31, 2017
USD ($)
Business Acquisition [Line Items]      
Goodwill $ 291   $ 292
Fotonic i Norden dp AB      
Business Acquisition [Line Items]      
Business combination, consideration transferred   $ 17  
Consideration transferred in cash   15  
Deferred purchase consideration $ 2 $ 2  
Deferred purchase consideration period   18 months  
Number of Lidar and Time of Flight engineering experts acquired | expert   35  
Net assets acquired   $ 17  
Business combination, intangible assets   4  
Goodwill   $ 13  
Fotonic i Norden dp AB | IP      
Business Acquisition [Line Items]      
Intangible assets remaining useful life   5 years