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Summary of Significant Accounting Policies - Recent Acquisitions (Details)
$ in Millions, $ in Billions
Jan. 07, 2019
USD ($)
Mar. 28, 2018
USD ($)
Mar. 07, 2018
USD ($)
Aug. 28, 2017
USD ($)
Mar. 13, 2017
CLP ($)
Mar. 13, 2017
USD ($)
Nov. 10, 2016
USD ($)
Feb. 19, 2016
USD ($)
Feb. 19, 2016
GBP (£)
Vaas | Subsequent Event                  
Business Acquisition [Line Items]                  
Consideration transferred $ 445                
Avigilon                  
Business Acquisition [Line Items]                  
Consideration transferred   $ 974              
Net cash consideration at purchase   $ 980              
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      
Spillman Technologies                  
Business Acquisition [Line Items]                  
Net cash consideration at purchase             $ 221    
Airwave                  
Business Acquisition [Line Items]                  
Cash paid for acquisition               $ 1,000 £ 698,000,000
Consideration transferred, excluding third party debt paid and liabilities assumed | £                 £ 1