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Summary of Significant Accounting Policies - Recent Acquisitions (Details)
shares in Millions, $ in Millions, $ in Billions
Oct. 16, 2019
USD ($)
Jul. 11, 2019
USD ($)
Mar. 11, 2019
USD ($)
Jan. 07, 2019
USD ($)
shares
Mar. 28, 2018
USD ($)
Mar. 07, 2018
USD ($)
Aug. 28, 2017
USD ($)
Mar. 13, 2017
CLP ($)
Mar. 13, 2017
USD ($)
Data Solutions Business                  
Business Acquisition [Line Items]                  
Consideration transferred $ 85                
WatchGuard                  
Business Acquisition [Line Items]                  
Consideration transferred   $ 271              
Share-based compensation fair value   $ 16              
Average service period   2 years              
Cash paid for acquisition   $ 250              
Avtec                  
Business Acquisition [Line Items]                  
Consideration transferred     $ 136            
Cash paid for acquisition     $ 136            
Vaas                  
Business Acquisition [Line Items]                  
Consideration transferred       $ 445          
Share-based compensation fair value       $ 38          
Average service period       1 year          
Cash paid for acquisition       $ 231          
Acquisition shares (in shares) | shares       1.4          
Acquisition shares       $ 160          
Total consideration       $ 391          
Avigilon                  
Business Acquisition [Line Items]                  
Consideration transferred         $ 974        
Plant Holdings, Inc.                  
Business Acquisition [Line Items]                  
Cash paid for acquisition           $ 237      
Kodiak Networks                  
Business Acquisition [Line Items]                  
Consideration transferred             $ 225    
Interexport                  
Business Acquisition [Line Items]                  
Consideration transferred               $ 98 $ 147
Cash paid for acquisition                 $ 55