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Summary of Significant Accounting Policies - Identified Intangible Assets by Major Classification (Detail) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Intangible Assets Net Excluding Goodwill [Line Items]      
Gross $ 6,444 $ 6,334  
Accumulated Amortization (3,143) (2,804)  
Net Book Value 3,301 3,530 $ 3,849
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 4,074 4,024  
Accumulated Amortization (2,118) (1,874)  
Net Book Value 1,956 2,150  
Trademarks [Member]      
Intangible Assets Net Excluding Goodwill [Line Items]      
Gross 885 878  
Accumulated Amortization (317) (290)  
Net Book Value 568 588  
Other [Member]      
Intangible Assets Net Excluding Goodwill [Line Items]      
Gross 499 463  
Accumulated Amortization (324) (295)  
Net Book Value 175 168  
Patents [Member]      
Intangible Assets Net Excluding Goodwill [Line Items]      
Gross 602 585  
Accumulated Amortization (384) (345)  
Net Book Value $ 218 $ 240