Merger and Restructuring Activity - Additional Information (Detail) $ in Millions			1 Months Ended	3 Months Ended		9 Months Ended		21 Months Ended
	Dec. 28, 2019 DistributionCenterandSalesOffice	May 08, 2019 USD ($) Store DistributionCenterandSalesOffice	May 31, 2020 USD ($) Employee	Sep. 26, 2020 USD ($) Store Facility DistributionCenterandSalesOffice	Sep. 28, 2019 USD ($)	Sep. 26, 2020 USD ($) Store Facility DistributionCenterandSalesOffice	Sep. 28, 2019 USD ($)	Sep. 26, 2020 USD ($)
Business Acquisition [Line Items]
Merger and transaction related expenses				$ 3	$ 6	$ 17	$ 19
Costs to implement restructuring plan						$ 77
Number of retail stores closed | Store				6		6
Number of distribution facilities closed | Facility				2		2
Restructuring cash expenditure						$ 45
Maximize B2B Restructuring Plan
Business Acquisition [Line Items]
Number of retail stores planned to be closed | Store						63
Costs to implement restructuring plan				$ 17		$ 68
Restructuring cash expenditure				13		16
Maximize B2B Restructuring Plan | Severance and Related Employee Costs
Business Acquisition [Line Items]
Costs to implement restructuring plan			$ 55	1		43
Maximize B2B Restructuring Plan | Retail Store and Facility Closure Costs
Business Acquisition [Line Items]
Costs to implement restructuring plan			51	9		18
Maximize B2B Restructuring Plan | Other Costs Including Contract Termination Costs
Business Acquisition [Line Items]
Costs to implement restructuring plan			$ 37			16
Restructuring cash expenditure						8
Maximize B2B Restructuring Plan | Third-Party Professional Fees
Business Acquisition [Line Items]
Costs to implement restructuring plan				7		7
Maximize B2B Restructuring Plan | Maximum
Business Acquisition [Line Items]
Number of expected reduction in employee position | Employee			13,100
Costs to implement restructuring plan			$ 143
Maximize B2B Restructuring Plan | Maximum | Cash Expenditures
Business Acquisition [Line Items]
Costs to implement restructuring plan			$ 143
Business Acceleration Program
Business Acquisition [Line Items]
Number of retail stores planned to be closed | Store		85
Costs to implement restructuring plan		$ 107		$ 5		$ 19		$ 101
Number of retail stores closed | Store				10		57
Restructuring cash expenditure				$ 4		$ 27
Number of other facilities planned to be closed | DistributionCenterandSalesOffice		8
Number of other facilities closed | DistributionCenterandSalesOffice	7			0		1
Business Acceleration Program | Cash Expenditures
Business Acquisition [Line Items]
Costs to implement restructuring plan		$ 99
Business Acceleration Program | Retail Store and Facility Closure Costs
Business Acquisition [Line Items]
Costs to implement restructuring plan				$ 3		$ 8
Business Acceleration Program | Other Costs Including Contract Termination Costs
Business Acquisition [Line Items]
Costs to implement restructuring plan						21
Restructuring cash expenditure						22
Business Acceleration Program | Third-Party Professional Fees
Business Acquisition [Line Items]
Costs to implement restructuring plan				$ 2		$ 11