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Goodwill and Other Intangible Assets - Additional Information (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]      
Goodwill $ 6,215 $ 5,984 $ 5,740
Increase in goodwill during the period 231    
Amortization expenses for other intangible assets 100 $ 76 $ 78
Indefinite-lived intangible assets 18    
Expected amortization expenses related to other intangible assets in 2017 97    
Expected amortization expenses related to other intangible assets in 2018 87    
Expected amortization expenses related to other intangible assets in 2019 77    
Expected amortization expenses related to other intangible assets in 2020 69    
Expected amortization expenses related to other intangible assets in 2021 $ 58