Summary of Major Components of Merger and Restructuring Expenses, Net (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017
Merger and transaction related expenses, net
Severance and retention	$ 3		$ 5
Transaction and integration	4	$ 5	11	$ 11
Facility closure, contract termination, and other expenses, net	5	(2)	8	2
Total Merger and transaction related expenses, net	12	3	24	13
Restructuring expenses
Severance		6		15
Facility closure, contract termination, professional fees and other expenses, net	2	11	7	12
Total Restructuring expenses	2	17	7	27
Total Merger and restructuring expenses, net	$ 14	$ 20	$ 31	$ 40