Acquisitions (Narrative) (Details) $ in Millions		1 Months Ended	3 Months Ended		9 Months Ended
	Oct. 02, 2017 USD ($) branch state	Apr. 30, 2017 USD ($)	Sep. 30, 2017 USD ($) employee	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($) employee	Sep. 30, 2016 USD ($)	Dec. 31, 2016 USD ($) employee branch
Business Acquisition [Line Items]
Property and equipment, net			$ 451		$ 451		$ 430
Merger related costs			$ 16	$ 0	$ 32	$ 0
Increase in volume of OEC on rent (as a percent)			18.20%		14.50%
NES Rentals Holdings II, Inc.
Business Acquisition [Line Items]
Revenue reported by acquired entity for last annual period		$ 369
Aggregate consideration paid		$ 960
Merger related costs			$ 1		$ 17
Neff Corporation | Subsequent Event
Business Acquisition [Line Items]
Revenue reported by acquired entity for last annual period	$ 413
Aggregate consideration paid	$ 1,300
NES Rentals Holdings II, Inc.
Business Acquisition [Line Items]
Number of rental locations (branch) | branch							73
Number of employees | employee							1,100
NES Rentals Holdings II, Inc. | Rental equipment
Business Acquisition [Line Items]
Property and equipment, net							$ 900
Neff Corporation
Business Acquisition [Line Items]
Number of employees | employee			1,100		1,100
Neff Corporation | Subsequent Event
Business Acquisition [Line Items]
Number of rental locations (branch) | branch	69
Number of states | state	14
Neff Corporation | Rental equipment
Business Acquisition [Line Items]
Property and equipment, net			$ 860		$ 860