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Investment in Associates and Joint Ventures - Summary of Investments in Associates and Joint Ventures (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of associates and joint ventures [line items]      
Beginning balance $ 141 $ 111  
Share of profits/(losses) 1 (3) $ 2
Ending balance 104 141 111
Cost [member]      
Disclosure of associates and joint ventures [line items]      
Beginning balance 178 139  
Additions 3 47  
Share of profits/(losses) (1) 3  
Disposals   (9)  
Distributions (37) (4)  
Exchange (3) 2  
Ending balance 140 178 139
Accumulated impairment [member]      
Disclosure of associates and joint ventures [line items]      
Beginning balance (37) (28)  
Charge for the year   (18)  
Disposals   9  
Exchange 1    
Ending balance (36) (37) (28)
Joint ventures [member]      
Disclosure of associates and joint ventures [line items]      
Beginning balance 27 26  
Ending balance 0 27 26
Joint ventures [member] | Cost [member]      
Disclosure of associates and joint ventures [line items]      
Beginning balance 27 26  
Share of profits/(losses) 5 1  
Distributions (32)    
Ending balance 0 27 26
Joint ventures [member] | Accumulated impairment [member]      
Disclosure of associates and joint ventures [line items]      
Ending balance 0    
Associates [member]      
Disclosure of associates and joint ventures [line items]      
Beginning balance 114 85  
Ending balance 104 114 85
Associates [member] | Cost [member]      
Disclosure of associates and joint ventures [line items]      
Beginning balance 151 113  
Additions 3 47  
Share of profits/(losses) (6) 2  
Disposals   (9)  
Distributions (5) (4)  
Exchange (3) 2  
Ending balance 140 151 113
Associates [member] | Accumulated impairment [member]      
Disclosure of associates and joint ventures [line items]      
Beginning balance (37) (28)  
Charge for the year   (18)  
Disposals   9  
Exchange 1    
Ending balance $ (36) $ (37) $ (28)