Acquisitions (Pro Forma) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended																12 Months Ended					0 Months Ended	12 Months Ended
	Dec. 31, 2013		Sep. 30, 2013		Jun. 30, 2013		Mar. 31, 2013		Dec. 31, 2012		Sep. 30, 2012		Jun. 30, 2012		Mar. 31, 2012		Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011	Apr. 30, 2012 RSC [Member] Quarter	Dec. 31, 2012 RSC [Member]	Dec. 31, 2011 RSC [Member]	Dec. 31, 2012 Impact of fair value mark-ups/useful life changes on depreciation [Member]		Dec. 31, 2011 Impact of fair value mark-ups/useful life changes on depreciation [Member]		Dec. 31, 2012 Impact of the fair value mark-up of acquired RSC fleet on cost of rental equipment sales [Member]		Dec. 31, 2011 Impact of the fair value mark-up of acquired RSC fleet on cost of rental equipment sales [Member]		Dec. 31, 2012 Intangible asset amortization [Member]		Dec. 31, 2011 Intangible asset amortization [Member]		Dec. 31, 2012 Interest expense on merger financing notes [Member]		Dec. 31, 2011 Interest expense on merger financing notes [Member]		Dec. 31, 2012 Elimination of historic RSC interest [Member]		Dec. 31, 2011 Elimination of historic RSC interest [Member]		Dec. 31, 2012 RSC historic interest fair value adjustment [Member]		Dec. 31, 2011 RSC historic interest fair value adjustment [Member]		Dec. 31, 2012 Elimination of merger costs [Member]		Dec. 31, 2011 Elimination of merger costs [Member]		Dec. 31, 2012 Restructuring charges [Member]		Dec. 31, 2011 Restructuring charges [Member]
Business Acquisition [Line Items]
Revenues	$ 1,338	[1]	$ 1,311	[1]	$ 1,206	[1]	$ 1,100	[1]	$ 1,249	[2]	$ 1,219	[2]	$ 993	[2]	$ 656	[2]	$ 4,955	[1]	$ 4,117	[2]	$ 2,611		$ 547	$ 1,522
Pro forma revenues																			4,664		4,133
Historic pretax income (loss)																	605		88		164		(8)	(40)
Pro forma pretax income (loss), before adjustments																			80		124
Pro forma adjustments to pretax income																									0	[3]	0	[3]	(4)	[4]	(12)	[4]	(43)	[5]	(173)	[5]	(39)	[6]	(207)	[6]	38	[7]	166	[7]	2	[8]	7	[8]	148	[9]	30	[9]	92	[10]	(101)	[10]
Pro forma pretax income (loss)																			$ 274		$ (166)
Restructuring charges, number of quarters																						5
Restructuring charges, percent of charges reflected in first year (over 95%)																						95.00%

[1] The fourth quarter of 2013 includes a reduction in bad debt expense of $17 as compared to the fourth quarter of 2012 primarily due to improved receivable aging. In the fourth quarter of 2013, we recognized a benefit of $3 in cost of equipment rentals, excluding depreciation related to our provision for self-insurance reserves.

[2] During the fourth quarter of 2012, we recognized $13 of charges associated with the RSC acquisition. Additionally, during the quarter, we recognized restructuring charges of $6, primarily reflecting branch closure charges associated with the RSC acquisition. During the quarter, we also recognized asset impairment charges of $2 which are primarily reflected in non-rental depreciation and amortization and principally relate to write-offs of leasehold improvements and other fixed assets. During the fourth quarter of 2012, we redeemed our 10 7/8 percent Senior Notes and all of our outstanding 1 7/8 percent Convertible Senior Subordinated Notes were converted. Upon redemption/conversion, we recognized a loss of $72 in interest expense, net. The loss represents the difference between the net carrying amount and the total purchase/conversion price of these securities. During the quarter, we also recognized a benefit of $6 in cost of equipment rentals, excluding depreciation related to our provision for self-insurance reserves. Additionally, operating income for the fourth quarter 2012 included $8 of costs, in the aggregate, primarily related to the merger, which should have been recognized in the second and third quarters of 2012. There was no impact on 2012 full year operating income.

[3] Depreciation of rental equipment and non-rental depreciation were adjusted for the fair value mark-ups of equipment acquired in the RSC acquisition, the impact of which was offset by the impact of extending the useful lives of such equipment.

[4] Cost of rental equipment sales was adjusted for the fair value mark-ups of rental equipment acquired in the RSC acquisition.

[5] The intangible assets acquired in the RSC acquisition were amortized.

[6] Interest expense was adjusted to reflect interest on the merger financing notes described in note 12 to the consolidated financial statements.

[7] RSC historic interest on debt that is not part of the combined entity was eliminated.

[8] RSC historic interest was adjusted for the fair value mark-ups of the debt acquired in the RSC acquisition.

[9] The RSC merger related costs were eliminated as they were assumed to have been recognized prior to the pro forma acquisition date.

[10] Restructuring charges comprised of severance costs and branch closure charges associated with the acquisition were recognized for 5 quarters (the period from the actual acquisition date through the end of the restructuring program) following the pro forma acquisition date. For the pro forma presentation, over 95 percent of the total charges are reflected in the first year following the pro forma acquisition date, which reflects the timing of the actual restructuring charges.