Summary of Major Components of Merger and Restructuring Expenses, Net (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 26, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019
Merger and transaction related expenses
Severance and retention				$ 1
Transaction and integration	$ 3	$ 6	$ 17	18
Total Merger and transaction related expenses	3	6	17	19
Restructuring expenses
Severance	1		43	40
Professional fees	10	12	21	31
Facility closure, contract termination, and other expenses, net	12	4	26	15
Total Restructuring expenses	23	16	90	86
Total Merger and restructuring expenses, net	$ 26	$ 22	$ 107	$ 105