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Acquisitions - Schedule of Purchase Price Allocation (Detail) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Business Acquisition [Line Items]      
Net purchase price $ 223 $ (8)  
Fair value of net assets acquired:      
Goodwill 457   $ 346
Series of Individually Immaterial Business Acquisitions      
Business Acquisition [Line Items]      
Purchase price including contingent consideration 257    
Less: cash acquired (29)    
Net purchase price 228    
Fair value of net assets acquired:      
Current assets other than cash 90    
Property, Plant and Equipment 24    
Intangible assets 64    
Current liabilities (51)    
Deferred tax liabilities, net (14)    
Other non-current liability (1)    
Total fair value of net assets acquired 112    
Goodwill 116    
Series of Individually Immaterial Business Acquisitions | Trade Names [Member]      
Fair value of net assets acquired:      
Intangible assets 10    
Series of Individually Immaterial Business Acquisitions | Customer Relationships [Member]      
Fair value of net assets acquired:      
Intangible assets $ 54