Merger and Restructuring Activity - Additional Information (Detail) $ in Millions		12 Months Ended			39 Months Ended
	May 08, 2019 USD ($) Store DistributionCenterandSalesOffice	Dec. 28, 2019 USD ($) Store DistributionCenterandSalesOffice	Dec. 29, 2018 USD ($)	Dec. 30, 2017 USD ($)	Dec. 28, 2019 USD ($) Store DistributionCenterandSalesOffice
Business Acquisition [Line Items]
Merger and transaction related expenses		$ 24	$ 56	$ 42
Costs to implement restructuring plan		90	20
Professional fees		$ 41	11	6
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 other facilities closed | DistributionCenterandSalesOffice		7			7
Costs to implement restructuring plan	$ 107	$ 82
Business Acceleration Program | Cash Expenditures through 2021
Business Acquisition [Line Items]
Costs to implement restructuring plan	104
Business Acceleration Program | Severance and Related Employee Costs
Business Acquisition [Line Items]
Costs to implement restructuring plan	40	40
Expected restructuring cost paid		69			$ 69
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	7
Business Acceleration Program | Third-Party Costs
Business Acquisition [Line Items]
Costs to implement restructuring plan	49
Business Acceleration Program | Other Costs
Business Acquisition [Line Items]
Costs to implement restructuring plan	$ 9	42
Business Acceleration Program | Third-Party Professional Fees
Business Acquisition [Line Items]
Costs to implement restructuring plan		39
Business Acceleration Program | Retail Store and Facility Closure Costs and Other
Business Acquisition [Line Items]
Costs to implement restructuring plan		3
Comprehensive Business Review
Business Acquisition [Line Items]
Costs to implement restructuring plan		$ 8	5	50
Number of retail stores closed | Store		54			208
Comprehensive Business Review | Other Costs
Business Acquisition [Line Items]
Costs to implement restructuring plan		$ 6	6
Strategic Plan
Business Acquisition [Line Items]
Professional fees			$ 11	$ 2