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Summary of Significant Accounting Policies - Identified Intangible Assets by Major Classification (Detail) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Intangible Assets Net Excluding Goodwill [Line Items]      
Gross $ 6,320 $ 6,559  
Accumulated Amortization (2,471) (2,115)  
Net Book Value 3,849 4,444 $ 5,055
Indefinite-lived Trade Names [Member]      
Intangible Assets Net Excluding Goodwill [Line Items]      
Gross 384 536  
Net Book Value 384 536  
Customer Relationships [Member]      
Intangible Assets Net Excluding Goodwill [Line Items]      
Gross 4,016 4,094  
Accumulated Amortization (1,630) (1,379)  
Net Book Value 2,386 2,715  
Trademarks [Member]      
Intangible Assets Net Excluding Goodwill [Line Items]      
Gross 880 871  
Accumulated Amortization (265) (226)  
Net Book Value 615 645  
Other [Member]      
Intangible Assets Net Excluding Goodwill [Line Items]      
Gross 1,040 1,058  
Accumulated Amortization (576) (510)  
Net Book Value $ 464 $ 548