Severance and Facility Closure Costs (Detail) - USD ($) $ in Millions		1 Months Ended	3 Months Ended	6 Months Ended	18 Months Ended
	May 08, 2019	May 31, 2020	Jun. 27, 2020	Jun. 27, 2020	Jun. 27, 2020
Restructuring Cost and Reserve [Line Items]
Beginning Balance				$ 22
Charges Incurred				58
Cash Payments				(26)
Ending Balance			$ 54	54	$ 54
Maximize B2B Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Charges Incurred		$ 143	51
Business Acceleration Program
Restructuring Cost and Reserve [Line Items]
Charges Incurred	$ 108		6	14	96
Cash Payments			(13)	(23)
Termination benefits | Merger related accruals
Restructuring Cost and Reserve [Line Items]
Beginning Balance				1
Ending Balance			1	1	1
Termination benefits | Maximize B2B Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Charges Incurred				40
Cash Payments				(3)
Ending Balance			37	37	37
Termination benefits | Business Acceleration Program
Restructuring Cost and Reserve [Line Items]
Beginning Balance				13
Charges Incurred				(1)
Cash Payments				(6)
Ending Balance			6	6	6
Lease and contract obligations, accruals for facilities closures and other costs | Merger related accruals
Restructuring Cost and Reserve [Line Items]
Charges Incurred				2
Ending Balance			2	2	2
Lease and contract obligations, accruals for facilities closures and other costs | Maximize B2B Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Charges Incurred		$ 37		2
Ending Balance			2	2	2
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				15
Cash Payments				(16)
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