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Acquisitions - Additional Information (Detail)
shares in Millions, $ in Millions
1 Months Ended 6 Months Ended
Nov. 08, 2017
USD ($)
shares
Apr. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Business
Dec. 30, 2017
USD ($)
Business Acquisition, Acquisition Related Costs [Line Items]        
Number of business acquired | Business     2  
Goodwill     $ 881 $ 851
Multiple Acquisition        
Business Acquisition, Acquisition Related Costs [Line Items]        
Contingent consideration estimated to be paid in 2019     14  
Business combination consideration transferred     47  
Goodwill     33  
Multiple Acquisition | Customer Relationships        
Business Acquisition, Acquisition Related Costs [Line Items]        
Intangible assets acquired     $ 8  
CompuCom Systems, Inc        
Business Acquisition, Acquisition Related Costs [Line Items]        
Business combination consideration transferred $ 937      
Payment to acquire business $ 52 $ 18    
CompuCom Systems, Inc | Common Stock        
Business Acquisition, Acquisition Related Costs [Line Items]        
Business combination consideration transferred common stock issued, shares | shares 44      
Business combination consideration transferred common stock issued, value $ 135      
CompuCom Systems, Inc | Term Loan Facility        
Business Acquisition, Acquisition Related Costs [Line Items]        
Business combination consideration transferred liabilities incurred $ 750      
Senior secured term loan, term 5 years