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Acquisitions - Additional Information (Details)
£ in Millions, $ in Millions, $ in Millions
6 Months Ended
Jun. 30, 2020
USD ($)
Jun. 30, 2020
GBP (£)
Jun. 30, 2020
CAD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Business Acquisition [Line Items]          
Acquisition $ 193        
Goodwill 3,939       $ 3,900
Arena Group, Altodigital Networks and ITEC Connect          
Business Acquisition [Line Items]          
Acquisition $ 171 £ 132      
Arena Group          
Business Acquisition [Line Items]          
Percentage of ownership acquired 100.00%        
Altodigital Networks          
Business Acquisition [Line Items]          
Percentage of ownership acquired 100.00%        
ITEC Connect          
Business Acquisition [Line Items]          
Percentage of ownership acquired 100.00%        
Digitex Canada          
Business Acquisition [Line Items]          
Acquisition $ 22   $ 29    
Percentage of ownership acquired 100.00%        
2020 Acquisitions          
Business Acquisition [Line Items]          
Intangible assets $ 70        
Goodwill $ 100        
HP Inc. | Bridge Loan          
Business Acquisition [Line Items]          
Short-term Debt, Amount Committed by Lender       $ 24,000