Quarterly report pursuant to Section 13 or 15(d)

Acquisitions (Detail)

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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