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Summary of Significant Accounting Policies - Identified Intangible Assets by Major Classification (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Intangible Assets Net Excluding Goodwill [Line Items]      
Gross $ 6,804 $ 6,129  
Accumulated Amortization (1,749) (1,386)  
Net Book Value 5,055 4,743 4,073
Indefinite-lived trade names [Member]
      
Intangible Assets Net Excluding Goodwill [Line Items]      
Gross 643 643  
Accumulated Amortization        
Net Book Value 643 643  
Customer relationships [Member]
      
Intangible Assets Net Excluding Goodwill [Line Items]      
Gross 4,093 3,522  
Accumulated Amortization (1,147) (907)  
Net Book Value 2,946 2,615  
Trademarks [Member]
      
Intangible Assets Net Excluding Goodwill [Line Items]      
Gross 893 877  
Accumulated Amortization (195) (152)  
Net Book Value 698 725  
Other [Member]
      
Intangible Assets Net Excluding Goodwill [Line Items]      
Gross 1,175 1,087  
Accumulated Amortization (407) (327)  
Net Book Value $ 768 $ 760