Segment Information (Reconciliation to consolidated totals) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Segment Reporting, Measurement Disclosures [Abstract]
Total equipment rentals gross profit	$ 1,710	$ 1,364	$ 736
Gross profit from other lines of business	277	223	162
Selling, general and administrative expenses	(642)	(588)	(407)
RSC merger related costs	(9)	(111)	(19)
Restructuring charge	(12)	(99)	(19)
Non-rental depreciation and amortization	(246)	(198)	(57)
Interest expense, net	(475)	(512)	(228)
Interest expense- subordinated convertible debentures	(3)	(4)	(7)
Other income, net	5	13	3
Income before provision for income taxes	$ 605	$ 88	$ 164