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Trade and Other Receivables - Summary of Trade and Other Receivables (Detail) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Current      
Trade receivables $ 474 $ 452  
Other receivables 27 23  
Prepayments 111 74  
Loans to and receivables from associates 1 2  
Trade and other current receivables $ 613 $ 551 $ 469