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Acquisitions (Narrative - NES Acquisition) (Details)
$ in Millions
1 Months Ended
Apr. 30, 2017
USD ($)
branch
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
employee
Business Acquisition [Line Items]        
Rental assets   $ 9,600 $ 7,824  
NES        
Business Acquisition [Line Items]        
Revenue reported by acquired entity for last annual period $ 369      
Consideration transferred $ 960      
NES        
Business Acquisition [Line Items]        
Number of branch locations | branch 73      
Number of entity employees | employee       1,100
Rental assets       $ 900