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Basis of Presentation - Recent Acquisitions (Details) - USD ($)
shares in Millions, $ in Millions
Jul. 11, 2019
Mar. 11, 2019
Jan. 07, 2019
Mar. 28, 2018
Mar. 07, 2018
WatchGuard          
Business Acquisition [Line Items]          
Consideration transferred $ 271        
Share-based compensation acquired $ 16        
Share-based compensation withheld, average service period 2 years        
Cash paid for acquisition, net of cash acquired $ 250        
Avtec          
Business Acquisition [Line Items]          
Cash paid for acquisition, net of cash acquired   $ 136      
VaaS          
Business Acquisition [Line Items]          
Consideration transferred     $ 445    
Share-based compensation acquired     $ 38    
Share-based compensation withheld, average service period     1 year    
Cash paid for acquisition, net of cash acquired     $ 231    
Shares issued (in shares)     1.4    
Share value     $ 160    
Total consideration     $ 391    
Avigilon          
Business Acquisition [Line Items]          
Consideration transferred       $ 974  
Plant Holdings, Inc.          
Business Acquisition [Line Items]          
Cash paid for acquisition, net of cash acquired         $ 237