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Restructuring Charges (Narrative) (Details)
$ in Millions
3 Months Ended
Jun. 30, 2017
work_stream
Dec. 31, 2017
USD ($)
restructuring_program
Restructuring Cost and Reserve [Line Items]    
Restructuring charges incurred to date   $ 284
Closed Restructuring Programs    
Restructuring Cost and Reserve [Line Items]    
Number of restructuring programs | restructuring_program   3
Restructuring charges incurred to date   $ 236
Closed Restructuring Programs | Branch closure charges    
Restructuring Cost and Reserve [Line Items]    
Restructuring charges incurred to date   162
Closed Restructuring Programs | Severance and other    
Restructuring Cost and Reserve [Line Items]    
Restructuring charges incurred to date   $ 74
NES, Neff And Project XL Restructuring Program    
Restructuring Cost and Reserve [Line Items]    
Number of specific work streams | work_stream 8