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Cash and Cash Equivalents - Summary of Cash and Cash Equivalents in the Statement of Cash Flows (Detail) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Cash and cash equivalents [abstract]        
Cash at bank and in hand $ 202 $ 164    
Short-term deposits 234 4    
Repurchase agreements 268      
Cash and cash equivalents 704 168 $ 206  
Bank overdrafts (104) (110)    
Cash flows, cash and cash equivalents $ 600 $ 58 $ 117 $ 1,098