Summary of Major Components of Merger and Restructuring Expenses, Net (Detail) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 28, 2019	Sep. 28, 2019	Jun. 29, 2019	Mar. 30, 2019	Dec. 29, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017
Merger and transaction related expenses
Severance and retention									$ 1	$ 11
Transaction and integration									23	35	$ 37
Facility closure, contract termination and other expenses, net										10	5
Total Merger and transaction related expenses									24	56	42
Restructuring expenses
Severance									40		28
Professional fees									41	11	6
Facility closure, contract termination, and other expenses, net									11	5	18
Total Restructuring expenses									92	16	52
Total Merger and restructuring expenses, net	$ 11	$ 22	$ 69	$ 14	$ 27	$ 14	$ 14	$ 17	$ 116	$ 72	$ 94