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Trade and Other Receivables - Summary of Ageing of Trade and Other Receivables (Detail) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of trade and other receivables [line items]        
Gross $ 513 $ 554    
Credit loss allowance (11) (77) $ (69) $ (56)
Net 502 477    
Not past due [member]        
Disclosure of trade and other receivables [line items]        
Gross 356 333    
Credit loss allowance (1) (1)    
Net 355 332    
Past due 1 to 30 days [member]        
Disclosure of trade and other receivables [line items]        
Gross 71 68    
Credit loss allowance (1) (2)    
Net 70 66    
Past due 31 to 180 days [member]        
Disclosure of trade and other receivables [line items]        
Gross 86 82    
Credit loss allowance (9) (7)    
Net 77 75    
Past due more than 180 days [member]        
Disclosure of trade and other receivables [line items]        
Gross 0 71    
Credit loss allowance 0 (67)    
Net $ 0 $ 4