Acquisitions (Purchase Price Allocation) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013		Sep. 30, 2013	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010		Apr. 30, 2012 RSC [Member]
Business Acquisition [Line Items]
Accounts receivable, net of allowance for doubtful accounts (1)										$ 238	[1]
Inventory										23
Deferred taxes										15
Rental equipment										2,013
Property and equipment										47
Intangibles (2)										1,224	[2]
Other assets										55
Total identifiable assets acquired										3,615
Short-term debt and current maturities of long-term debt (3)										(1,586)	[3]
Current liabilities										(400)
Deferred taxes										(696)
Long-term debt (3)										(992)	[3]
Other long-term liabilities										(13)
Total liabilities assumed										(3,687)
Net identifiable assets acquired										(72)
Goodwill (4)	2,953	[4]	2,300	2,970	[4]	289	[4]	198	[4]	2,658	[5]
Total purchase consideration										2,586
Accounts receivable, gross										251
Accounts receivable, allowance for doubtful accounts										$ 13

[1] The fair value of accounts receivables acquired was $238, and the gross contractual amount was $251. We estimated that $13 will be uncollectible.

[2] The following table reflects the estimated fair values and useful lives of the acquired intangible assets identified based on our purchase accounting assessments: Fair value Life (years) Customer relationships$1,09415 Trade names and associated trademarks815 Non-compete agreements495 Total$1,224

[3] At the closing of the merger, URNA repaid RSC's senior ABL facility, 10 percent senior notes, and 9.5 percent senior notes. The repaid debt is reflected as short-term above as it was paid on the acquisition date. The RSC debt reflected in our consolidated balance sheet as of December 31, 2013 is discussed further in note 12 to the consolidated financial statements. The debt in the table above includes $1,555 of the repaid RSC debt, and the fair values of the following debt assumed by URNA: 10 1/4 percent Senior Notes$(225) 8 1/4 percent Senior Notes(699) Capital leases(99) Total assumed debt$(1,023)

[4] The total carrying amount of goodwill for all periods in the table above is reflected net of $1,557 of accumulated impairment charges, which were primarily recorded in our general rentals segment.

[5] All of the goodwill was assigned to our general rentals segment. The level of goodwill that resulted from the merger is primarily reflective of RSC's going-concern value, the value of RSC's assembled workforce, new customer relationships expected to arise from the merger, and operational synergies that we expect to achieve that would not be available to other market participants. $39 of the goodwill is expected to be deductible for income tax purposes.