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Acquisitions - Additional Information (Detail) $ in Millions	6 Months Ended
	Jun. 30, 2015 USD ($) Acquisition	Dec. 31, 2014 USD ($)
Business Acquisition [Line Items]
Goodwill	$ 457	$ 346
Series of Individually Immaterial Business Acquisitions
Business Acquisition [Line Items]
Number of acquisitions completed | Acquisition	4
Purchase price	$ 257
Goodwill	116
Intangible assets	64
Business Acquisition Acquiree One
Business Acquisition [Line Items]
Business acquisition, maximum contingent consideration payments	6
Business acquisition, fair value of contingent consideration payments as of acquisition date	$ 4

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- Definition

Business combination contingent consideration liability noncurrent as of acquisition date.

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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- Definition

For contingent consideration arrangements recognized in connection with a business combination, this element represents an estimate of the high-end of the potential range (undiscounted) of the consideration which may be paid.

+ References

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-Publisher FASB



-Name Accounting Standards Codification



-Topic 805



-SubTopic 30



-Section 50



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- Definition

The amount of identifiable intangible assets recognized as of the acquisition date.

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- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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- Definition

The number of businesses acquired by the entity during the period.

+ References

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- Definition

The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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