Summary of Major Components of Merger and Restructuring Expenses, Net (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Apr. 01, 2017
Merger and transaction related expenses, net
Severance and retention	$ 2
Transaction and integration	7	$ 6
Facility closure, contract termination, and other expenses, net	3	4
Total Merger and transaction related expenses, net	12	10
Restructuring expenses
Severance		9
Facility closure, contract termination, professional fees and other expenses, net	5	1
Total Restructuring expenses	5	10
Total Merger and restructuring expenses, net	$ 17	$ 20