Acquisitions (Purchase Price Allocation) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011		Apr. 30, 2014
Business Acquisition [Line Items]
Goodwill	$ 3,272	[1]	$ 2,953	[1]	$ 2,970	[1]	$ 289	[1]
National Pump
Business Acquisition [Line Items]
Accounts receivable, net of allowance for doubtful accounts									44	[2]
Inventory									19
Deferred taxes									6
Intangibles									289	[3]
Other assets									1
Total identifiable assets acquired									541
Current liabilities									(25)
Total liabilities assumed									(25)
Net identifiable assets acquired									516
Goodwill									333	[4]
Net assets acquired									849
Accounts receivable, gross									47
Accounts receivable, allowance for doubtful accounts									3
Rental Equipment | National Pump
Business Acquisition [Line Items]
Rental equipment and Property and equipment									172
Property and Equipment | National Pump
Business Acquisition [Line Items]
Rental equipment and Property and equipment									$ 10

[1] 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.

[2] The fair value of accounts receivables acquired was $44, and the gross contractual amount was $47. We estimated that $3 would be uncollectible.

[3] 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$27410 Non-compete agreements156 Total$289

[4] $321 of the goodwill was assigned to our trench safety, power and HVAC (heating, ventilating and air conditioning), and pump solutions segment and $12 of the goodwill was assigned to our general rentals segment. The level of goodwill that resulted from the merger is primarily reflective of National Pump's going-concern value, the value of National Pump'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. $348 of goodwill is expected to be deductible for income tax purposes.