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Cash and Cash Equivalents - Summary of Cash and Cash Equivalents (Detail) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
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