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Segment Information - Additional Information (Detail)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 28, 2019
USD ($)
Sep. 29, 2018
USD ($)
Sep. 28, 2019
USD ($)
Segment
Sep. 29, 2018
USD ($)
Segment Reporting Information [Line Items]        
Number of reportable segments     3  
Number of operating segments     3  
Intersegment Eliminations        
Segment Reporting Information [Line Items]        
Revenues | $ $ 3 $ 4 $ 9 $ 10