Merger and Restructuring Activity - Additional Information (Detail) $ in Millions		3 Months Ended		15 Months Ended
	May 08, 2019 USD ($) Store DistributionCenterandSalesOffice	Mar. 28, 2020 USD ($) Store	Mar. 30, 2019 USD ($)	Mar. 28, 2020 USD ($)	Dec. 28, 2019 DistributionCenterandSalesOffice
Business Acquisition [Line Items]
Merger and transaction related expenses		$ 7	$ 8
Costs to implement restructuring plan		$ 8
Business Acceleration Program
Business Acquisition [Line Items]
Number of retail stores planned to be closed | Store	90
Number of other facilities planned to be closed | DistributionCenterandSalesOffice	9
Number of retail stores closed | Store		12
Number of other facilities closed | DistributionCenterandSalesOffice					7
Costs to implement restructuring plan	$ 109	$ 8		$ 90
Expected restructuring cost paid		10		$ 10
Business Acceleration Program | Cash Expenditures through 2021
Business Acquisition [Line Items]
Costs to implement restructuring plan	102
Business Acceleration Program | Severance and Related Employee Costs
Business Acquisition [Line Items]
Costs to implement restructuring plan	40
Business Acceleration Program | Employee Recruitment and Relocation Costs
Business Acquisition [Line Items]
Costs to implement restructuring plan	2
Business Acceleration Program | Retail Store and Facility Closure Costs
Business Acquisition [Line Items]
Costs to implement restructuring plan	12	3
Business Acceleration Program | Third-Party Costs
Business Acquisition [Line Items]
Costs to implement restructuring plan	48
Business Acceleration Program | Other Costs
Business Acquisition [Line Items]
Costs to implement restructuring plan	$ 7	8
Business Acceleration Program | Third-Party Professional Fees
Business Acquisition [Line Items]
Costs to implement restructuring plan		$ 5