Summary of Preliminary and Final Allocation of Purchase Consideration to Assets Acquired and Liabilities Assumed (Parenthetical) (Detail) - CompuCom Systems, Inc - USD ($) $ in Millions		Dec. 29, 2018	Nov. 08, 2017
Business Acquisition [Line Items]
Intangible assets	[1]	$ 386	$ 386
Trade Names
Business Acquisition [Line Items]
Intangible assets		70	70
Customer Relationships
Business Acquisition [Line Items]
Intangible assets		297	297
Developed Technology
Business Acquisition [Line Items]
Intangible assets		$ 19	$ 19

[1] Intangible assets acquired consist of customer relationships of $297 million, developed technology of $19 million, and trade names of $70 million.