Merger and Restructuring Activity - Additional Information (Detail) $ in Millions		1 Months Ended	3 Months Ended		6 Months Ended		18 Months Ended
	May 08, 2019 USD ($) Store DistributionCenterandSalesOffice	May 31, 2020 USD ($) Store Employee Facility	Jun. 27, 2020 USD ($) Store DistributionCenterandSalesOffice	Jun. 29, 2019 USD ($)	Jun. 27, 2020 USD ($) Store DistributionCenterandSalesOffice	Jun. 29, 2019 USD ($)	Jun. 27, 2020 USD ($) DistributionCenterandSalesOffice	Dec. 28, 2019 DistributionCenterandSalesOffice
Business Acquisition [Line Items]
Merger and transaction related expenses			$ 7	$ 5	$ 14	$ 13
Costs to implement restructuring plan					58
Restructuring cash expenditure					26
Maximize B2B Restructuring Plan
Business Acquisition [Line Items]
Number of expected reduction in employee position | Employee		13,100
Number of retail stores planned to be closed | Store		73
Number of facility planned to be closed | Facility		1
Costs to implement restructuring plan		$ 143	51
Expected restructuring cost paid			3		3		$ 3
Maximize B2B Restructuring Plan | Cash Expenditures
Business Acquisition [Line Items]
Costs to implement restructuring plan		143
Maximize B2B Restructuring Plan | Severance and Related Employee Costs
Business Acquisition [Line Items]
Costs to implement restructuring plan		55	42
Maximize B2B Restructuring Plan | Retail Store and Facility Closure Costs
Business Acquisition [Line Items]
Costs to implement restructuring plan		51	9
Maximize B2B Restructuring Plan | Other Costs Including Contract Termination Costs
Business Acquisition [Line Items]
Costs to implement restructuring plan		$ 37			2
Business Acceleration Program
Business Acquisition [Line Items]
Number of retail stores planned to be closed | Store	90
Costs to implement restructuring plan	$ 108		$ 6		$ 14		$ 96
Number of other facilities planned to be closed | DistributionCenterandSalesOffice	8
Number of retail stores closed | Store			35		47
Number of other facilities closed | DistributionCenterandSalesOffice			1		1		1	7
Restructuring cash expenditure			$ 13		$ 23
Business Acceleration Program | Cash Expenditures
Business Acquisition [Line Items]
Costs to implement restructuring plan	$ 100
Business Acceleration Program | Retail Store and Facility Closure Costs
Business Acquisition [Line Items]
Costs to implement restructuring plan			2		5
Business Acceleration Program | Other Costs Including Contract Termination Costs
Business Acquisition [Line Items]
Costs to implement restructuring plan					15
Restructuring cash expenditure					16
Business Acceleration Program | Third-Party Professional Fees
Business Acquisition [Line Items]
Costs to implement restructuring plan			$ 4		$ 9