Segment Information (Reconciliation to income (loss) from continuing operations) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015		Jun. 30, 2014
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Gross profit	$ 618	$ 589	$ 1,142		$ 1,037
Selling, general and administrative expenses	(175)	(187)	(356)		(355)
Merger related costs	(1)	(8)	26		(9)
Restructuring charge	0	1	(1)	[1]	0
Non-rental depreciation and amortization	(67)	(70)	(136)		(130)
Interest expense, net	(232)	(187)	(353)		(312)
Other income, net	6	4	9		5
Income before provision for income taxes	149	142	331		236
Equipment rentals
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Gross profit	535	503	981		882
Other lines of business
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Gross profit	$ 83	$ 86	$ 161		$ 155

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