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Cash and Cash Equivalents - Additional Information (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Cash and cash equivalents [line items]    
Bank balances $ 106 $ 116
Bank overdrafts $ 104 $ 110
Maximum [member]    
Cash and cash equivalents [line items]    
Short-term deposits and repurchase agreements maturity period 3 months