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Goodwill and Other Intangible Assets (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Goodwill and Other Intangible Assets      
Intangible assets amortization $ 101 $ 96 $ 100
Indefinite-lived intangible assets 18    
Expected amortization expenses related to other intangible assets in 2019 105    
Expected amortization expenses related to other intangible assets in 2020 94    
Expected amortization expenses related to other intangible assets in 2021 79    
Expected amortization expenses related to other intangible assets in 2022 63    
Expected amortization expenses related to other intangible assets in 2023 $ 55