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Acquisitions (Detail) (Series of Individually Immaterial Business Acquisitions [Member], USD $) In Millions, unless otherwise specified	Jun. 30, 2012
Series of Individually Immaterial Business Acquisitions [Member]
Acquisitions [Abstract]
Business Combinations During Period, Consideration Transferred	$ 458

This element represents the acquisition-date fair value of the total consideration transferred which consists of the sum of the acquisition-date fair values of the assets transferred by the acquirer, the liabilities incurred by the acquirer to former owners of the acquiree, and the equity interests issued by the acquirer.

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