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Summary of Significant Accounting Policies - Additional Information (Detail)
$ in Millions
 3 Months Ended 9 Months Ended
Jan. 01, 2018
USD ($)
Sep. 29, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 29, 2018
USD ($)
Segment
Sep. 30, 2017
USD ($)
Dec. 30, 2017
USD ($)
Summary Of Significant Accounting Policies [Line Items]            
Number of reportable segments | Segment       3    
Assets related to discontinued operation   $ 0   $ 0   $ 139
Liabilities related to discontinued operation   0   0   67
Accounts payable and accrued expenses and other current liabilities not yet presented for payment   106   106   53
Cash and cash equivalents   925   925   622
Cumulative effect on accumulated deficit, net of tax       4    
Reduction in sales from service   (9)   (47)    
Reduction in cost of service   (9)   (47)    
Selling, general and administrative expenses   (567) $ (506) (1,674) $ (1,519)  
Other income, net   4 2 11 8  
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)   (10)  
Other income, net     $ 3   $ 10  
Prepaid Expenses and Other Current Assets            
Summary Of Significant Accounting Policies [Line Items]            
Restricted cash, included in Prepaid expenses and other current assets   2   2   $ 3
Non-US            
Summary Of Significant Accounting Policies [Line Items]            
Cash and cash equivalents   $ 222   $ 222    
CompuCom            
Summary Of Significant Accounting Policies [Line Items]            
Percentage of revenue exceeding current revenue due to acquisition   10.00%   10.00%