Segment Information (Reconciliation to income (loss) from continuing operations) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014		Jun. 30, 2013
Segment Reporting, Measurement Disclosures [Abstract]
Total equipment rentals gross profit	$ 503	$ 402	$ 882		$ 723
Gross profit from other lines of business	86	69	155		133
Selling, general and administrative expenses	(187)	(152)	(355)		(312)
Merger related costs	(8)	(2)	(9)		(8)
Restructuring charge	1	(5)	0	[1]	(11)
Non-rental depreciation and amortization	(70)	(62)	(130)		(126)
Interest expense, net	(187)	(118)	(312)		(236)
Interest expense- subordinated convertible debentures	0	(1)	0		(3)
Other income, net	4	0	5		1
Income before provision for income taxes	$ 142	$ 131	$ 236		$ 161

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