Summary of Valuation Allowances (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Income Taxes [Line Items]
Beginning balance	$ 144
Impact of Tax Reform		$ 40
Ending balance	142	144
Valuation Allowance of Deferred Tax Assets
Income Taxes [Line Items]
Beginning balance	144	140	$ 522
Additions, charged to expense		4
Acquired via Merger		1
Impact of Tax Reform		40
Reductions	(2)	(41)	(382)
Ending balance	$ 142	$ 144	$ 140