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Severance and Facility Closure Costs (Detail) - USD ($) $ in Millions		1 Months Ended	3 Months Ended	9 Months Ended	21 Months Ended
	May 08, 2019	May 31, 2020	Sep. 26, 2020	Sep. 26, 2020	Sep. 26, 2020
Restructuring Cost and Reserve [Line Items]
Beginning Balance				$ 22
Charges Incurred				77
Cash Payments				(45)
Ending Balance			$ 54	54	$ 54
Maximize B2B Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Charges Incurred			17	68
Cash Payments			(13)	(16)
Business Acceleration Program
Restructuring Cost and Reserve [Line Items]
Charges Incurred	$ 107		5	19	101
Cash Payments			(4)	(27)
Termination benefits \| Merger related accruals
Restructuring Cost and Reserve [Line Items]
Beginning Balance				1
Charges Incurred				1
Cash Payments				(1)
Ending Balance			1	1	1
Termination benefits \| Maximize B2B Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Charges Incurred				38
Cash Payments				(7)
Ending Balance			31	31	31
Termination benefits \| Business Acceleration Program
Restructuring Cost and Reserve [Line Items]
Beginning Balance				13
Charges Incurred				(1)
Cash Payments				(5)
Ending Balance			7	7	7
Lease and contract obligations, accruals for facilities closures and other costs \| Merger related accruals
Restructuring Cost and Reserve [Line Items]
Charges Incurred				2
Cash Payments				(1)
Ending Balance			1	1	1
Lease and contract obligations, accruals for facilities closures and other costs \| Maximize B2B Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Charges Incurred		$ 37		16
Cash Payments				(8)
Ending Balance			8	8	8
Lease and contract obligations, accruals for facilities closures and other costs \| Business Acceleration Program
Restructuring Cost and Reserve [Line Items]
Beginning Balance				5
Charges Incurred				21
Cash Payments				(22)
Ending Balance			4	4	4
Lease and contract obligations, accruals for facilities closures and other costs \| Comprehensive Business Review
Restructuring Cost and Reserve [Line Items]
Beginning Balance				3
Cash Payments				(1)
Ending Balance			$ 2	$ 2	$ 2