Segment Information (Reconciliation to income (loss) from continuing operations) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013		Jun. 30, 2012
Segment Reporting, Measurement Disclosures [Abstract]
Total equipment rentals gross profit	$ 402	$ 323	$ 723		$ 485
Gross profit from other lines of business	69	51	133		102
Selling, general and administrative expenses	(152)	(146)	(312)		(248)
RSC merger related costs	(2)	(80)	(8)		(90)
Restructuring charge	(5)	(53)	(11)	[1]	(53)
Non-rental depreciation and amortization	(62)	(49)	(126)		(63)
Interest expense, net	(118)	(121)	(236)		(189)
Interest expense- subordinated convertible debentures	(1)	(1)	(3)		(2)
Other income, net	0	12	1		13
Income (loss) before provision (benefit) for income taxes	$ 131	$ (64)	$ 161		$ (45)

[1] Reflected in our condensed consolidated statements of income as “Restructuring charge.” These charges are not allocated to our reportable segments.