Restructuring and Asset Impairment Charges (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011 employee location	Jan. 01, 2008 location	Dec. 31, 2007 employee
General rentals
Restructuring Cost and Reserve [Line Items]
Asset impairment charges	$ 1	$ 4	$ 15
Closed Restructuring Program
Restructuring Cost and Reserve [Line Items]
Number of employees				7,500		10,900
Number of branch locations				529	697
Restructuring charges incurred to date	110
Closed Restructuring Program | Branch closure charges
Restructuring Cost and Reserve [Line Items]
Restructuring charges incurred to date	89
Closed Restructuring Program | Severance costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges incurred to date	21
RSC Merger Related Restructuring Program
Restructuring Cost and Reserve [Line Items]
Number of employees	12,500
Number of branch locations	881
Restructuring charges incurred to date	104
RSC Merger Related Restructuring Program | Branch closure charges
Restructuring Cost and Reserve [Line Items]
Restructuring charges incurred to date	59
RSC Merger Related Restructuring Program | Severance costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges incurred to date	$ 45