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Acquisitions and Divestitures - Telogis, Inc. (Details) - USD ($)
$ in Millions
1 Months Ended
Jul. 31, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Business Acquisition [Line Items]        
Goodwill   $ 24,614 $ 29,172 $ 27,205
Telogis Inc        
Business Acquisition [Line Items]        
Business acquisition, purchase price in cash $ 900      
Corporate and other | Telogis Inc        
Business Acquisition [Line Items]        
Goodwill $ 500