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Summary of Significant Accounting Policies - Identified Intangible Assets by Major Classification (Detail) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Intangible Assets Net Excluding Goodwill [Line Items]      
Gross $ 6,334 $ 6,320  
Accumulated Amortization (2,804) (2,471)  
Net Book Value 3,530 3,849 $ 4,444
Indefinite-lived Trade Names [Member]      
Intangible Assets Net Excluding Goodwill [Line Items]      
Gross 384 384  
Net Book Value 384 384  
Customer Relationships [Member]      
Intangible Assets Net Excluding Goodwill [Line Items]      
Gross 4,024 4,016  
Accumulated Amortization (1,874) (1,630)  
Net Book Value 2,150 2,386  
Trademarks [Member]      
Intangible Assets Net Excluding Goodwill [Line Items]      
Gross 878 880  
Accumulated Amortization (290) (265)  
Net Book Value 588 615  
Other [Member]      
Intangible Assets Net Excluding Goodwill [Line Items]      
Gross 1,048 1,040  
Accumulated Amortization (640) (576)  
Net Book Value $ 408 $ 464