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Acquisitions and Divestitures - Fleetmatics Group PLC (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended
Jul. 31, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Nov. 07, 2016
Business Acquisition [Line Items]          
Goodwill   $ 24,614 $ 29,172 $ 27,205  
Fleetmatics Group PLC          
Business Acquisition [Line Items]          
Business acquisition, share price (in USD per share) $ 60.00        
Business acquisition consideration $ 2,500        
Cash acquired $ 100        
Goodwill         $ 1,400
Intangible assets subject to amortization         $ 1,100