Severance and Facility Closure Costs (Detail) - USD ($) $ in Millions	12 Months Ended
Dec. 29, 2018	Dec. 30, 2017
Restructuring Cost and Reserve [Line Items]
Beginning Balance	$ 32	$ 66
Charges Incurred	20	65
Cash Payments	(34)	(99)
Ending Balance	18	32
Termination benefits \| Merger related accruals
Restructuring Cost and Reserve [Line Items]
Beginning Balance	1	5
Charges Incurred	9	1
Cash Payments	(7)	(5)
Ending Balance	3	1
Termination benefits \| Comprehensive Business Review
Restructuring Cost and Reserve [Line Items]
Beginning Balance	4	8
Charges Incurred		28
Cash Payments	(4)	(32)
Ending Balance		4
Lease and contract obligations, accruals for facilities closures and other costs \| Merger related accruals
Restructuring Cost and Reserve [Line Items]
Beginning Balance	18	40
Charges Incurred	5	22
Cash Payments	(13)	(44)
Ending Balance	10	18
Lease and contract obligations, accruals for facilities closures and other costs \| Comprehensive Business Review
Restructuring Cost and Reserve [Line Items]
Beginning Balance	9	13
Charges Incurred	6	14
Cash Payments	(10)	(18)
Ending Balance	$ 5	$ 9

Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation.

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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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