Acquisitions (Pro Forma Information) (Details) - USD ($)		3 Months Ended		9 Months Ended
		Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Apr. 30, 2014
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Revenues			$ 1,544,000,000		$ 4,121,000,000
Pro forma revenues			1,544,000,000		4,183,000,000
Pretax income		$ 340,000,000	303,000,000	$ 671,000,000	539,000,000
Combined pretax income			303,000,000		559,000,000
Pro forma pretax income			297,000,000		612,000,000
Gain (loss) on redemption of debt				$ (123,000,000)	(80,000,000)
Impact of fair value mark-ups/useful life changes on depreciation
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Pro forma adjustments to combined pretax income	[1]		0		(1,000,000)
Intangible asset amortization
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Pro forma adjustments to combined pretax income	[2]		(1,000,000)		(12,000,000)
Interest expense
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Pro forma adjustments to combined pretax income	[3]		(4,000,000)		58,000,000
Elimination of merger costs
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Pro forma adjustments to combined pretax income	[4]		(1,000,000)		8,000,000
National Pump
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Revenues			0		62,000,000
Pretax income			$ 0		20,000,000
5 3/4 percent Senior Notes
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Stated interest rate		5.75%		5.75%
9 1/4 percent Senior Notes
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Gain (loss) on redemption of debt					$ (64,000,000)
Senior notes | Add-on to 6 1/8 percent Senior Notes
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Face amount						$ 525,000,000
Senior notes | Add-on to 6 1/8 percent Senior Notes | National Pump
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Stated interest rate						6.125%
Senior notes | 5 3/4 percent Senior Notes
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Face amount						$ 850,000,000
Senior notes | 5 3/4 percent Senior Notes | National Pump
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Stated interest rate						5.75%
Senior notes | 9 1/4 percent Senior Notes | National Pump
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Stated interest rate						9.25%

[1] Depreciation of rental equipment and non-rental depreciation were adjusted for the fair value mark-ups of equipment acquired in the National Pump acquisition. The useful lives assigned to such equipment did not change significantly from the lives historically used by National Pump.

[2] The intangible assets acquired in the National Pump acquisition were amortized.

[3] In connection with the National Pump acquisition, URNA issued $525 principal amount of 6 1/8 percent Senior Notes (as an add on to our existing 6 1/8 percent Senior Notes) and $850 principal amount of 5 3/4 percent Senior Notes, and all our outstanding 9 1/4 percent Senior Notes were redeemed. Interest expense was adjusted to reflect these changes in our debt portfolio. For the pro forma presentation, the $64 loss recognized upon redemption of the 9 1/4 percent Senior Notes was removed from the nine months ended September 30, 2014 as the loss was assumed to have been recognized prior to the pro forma acquisition date.

[4] Merger related costs, primarily comprised of financial and legal advisory fees, associated with the National Pump acquisition were eliminated as they were assumed to have been recognized prior to the pro forma acquisition date.