Summary of Significant Accounting Policies - Additional Information (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2018 USD ($) Segment	Apr. 01, 2017 USD ($)	Dec. 30, 2017 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Number of reportable segments | Segment	3
Accounts payable and accrued expenses and other current liabilities not yet presented for payment	$ 54		$ 53
Cash and cash equivalents	737		$ 622
Cash and cash equivalents, discontinued operations	37	$ 58
Cumulative effect on accumulated deficit, net of tax	(4)
Reduction in sales from service	(27)
Reduction in cost of service	(27)
Selling, general and administrative expenses	573	531
Other income, net	$ 1	4
CompuCom
Summary Of Significant Accounting Policies [Line Items]
Percentage of revenue exceeding current revenue due to acquisition	10.00%
Accounting Standards Update 2014-09
Summary Of Significant Accounting Policies [Line Items]
Cumulative effect on accumulated deficit, net of tax	$ (4)
Accounting Standards Update 2017-07 | Adjustment
Summary Of Significant Accounting Policies [Line Items]
Selling, general and administrative expenses		(3)
Other income, net		$ 3
Prepaid Expenses and Other Current Assets
Summary Of Significant Accounting Policies [Line Items]
Restricted cash, included in Prepaid expenses and other current assets	3
Non-US
Summary Of Significant Accounting Policies [Line Items]
Cash and cash equivalents	137
Cash and cash equivalents, discontinued operations	$ 37