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Investments in Associates - Additional Information (Detail) - USD ($)
$ in Millions
Dec. 31, 2018
Mar. 30, 2018
Dec. 31, 2017
AB InBev Efes [member]      
Disclosure of associates [line items]      
Percentage of voting equity interests acquired   50.00%  
Aggregated individually immaterial associates [member]      
Disclosure of associates [line items]      
Investments in associates $ 51   $ 78