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Summary of Preliminary Allocation of Purchase Price (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Business Acquisition [Line Items]      
Goodwill $ 842us-gaap_Goodwill $ 691us-gaap_Goodwill $ 375us-gaap_Goodwill