Acquisitions (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended			0 Months Ended	1 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Apr. 30, 2012	Apr. 30, 2014 location		May 31, 2014 location	Aug. 31, 2013 location	Dec. 31, 2011 location	Sep. 30, 2014
Business Acquisition [Line Items]
Merger related costs	$ 11	$ 9	$ 111
RSC
Business Acquisition [Line Items]
Percentage of equity interest acquired				100.00%
Fair value of consideration transferred				2,600
Revenue reported by acquired entity for last annual period				1,500
Number of branch locations									440
National Pump
Business Acquisition [Line Items]
Fair value of consideration transferred					849	[1]
Revenue reported by acquired entity for last annual period					210
Number of branch locations					35
Revenue	215
Pretax income	42
Blue Stream
Business Acquisition [Line Items]
Revenue reported by acquired entity for last annual period							20
Number of branch locations							4
United States | RSC
Business Acquisition [Line Items]
Number of states/provinces in which entity operates									43
Canadian provinces | RSC
Business Acquisition [Line Items]
Number of states/provinces in which entity operates									3
Canadian provinces | National Pump
Business Acquisition [Line Items]
Number of branch locations					4
Canadian provinces | Rent World
Business Acquisition [Line Items]
Revenue reported by acquired entity for last annual period								5
Number of branch locations								2
Merger related costs | National Pump
Business Acquisition [Line Items]
Merger related costs	10
Other noncurrent assets | National Pump
Business Acquisition [Line Items]
Capitalized debt issuance costs										$ 22

[1] Total purchase consideration excludes $15 of stock which was issued in connection with the acquisition and will be treated as compensation for book purposes but primarily represents deductible goodwill for income tax purposes.