Restructuring Charges (Narrative) (Details) $ in Millions	3 Months Ended
	Jun. 30, 2017 work_stream	Dec. 31, 2018 USD ($) restructuring_program
Restructuring Cost and Reserve [Line Items]
Restructuring charges incurred to date		$ 315
Closed Restructuring Programs
Restructuring Cost and Reserve [Line Items]
Number of restructuring programs | restructuring_program		3
Restructuring charges incurred to date		$ 237
Closed Restructuring Programs | Branch closure charges
Restructuring Cost and Reserve [Line Items]
Restructuring charges incurred to date		163
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]
Restructuring charges incurred to date		56
Number of specific work streams | work_stream	8
NES, Neff And Project XL Restructuring Program | Branch closure charges
Restructuring Cost and Reserve [Line Items]
Restructuring charges incurred to date		9
NES, Neff And Project XL Restructuring Program | Severance and other
Restructuring Cost and Reserve [Line Items]
Restructuring charges incurred to date		$ 47