Summary of Valuation Allowances (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017
Income Taxes [Line Items]
Beginning balance	$ 142
Impact of Tax Reform			$ 40
Ending balance	151	$ 142
Valuation Allowance of Deferred Tax Assets
Income Taxes [Line Items]
Beginning balance	142	144	140
Additions, charged to expense	9		4
Acquired via Merger			1
Impact of Tax Reform			40
Reductions		(2)	(41)
Ending balance	$ 151	$ 142	$ 144