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Investment in Associates and Joint Ventures - Summary of Financial Information of Material Associate Investment (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of associates [line items]      
Non-current assets $ 2,377 $ 2,147 $ 1,966
Current assets 1,376 863 796
Current liabilities (1,370) (1,280) (1,150)
Non-current liabilities (3,460) (3,031) (2,758)
Net assets (1,077) (1,301) (1,146)
Revenue 4,337 4,075 3,912
Profit/(loss) for the period 352 541 $ 459
Barclay associate [member]      
Disclosure of associates [line items]      
Non-current assets 529 540  
Current assets 70 41  
Current liabilities (17) (19)  
Non-current liabilities (319) (287)  
Net assets 263 275  
Revenue 103 90  
Profit/(loss) for the period (13) (16)  
Group's share of loss for the period, including the cost of funding owner returns (8) (4)  
Barclay associate [member] | Group share of reported net assets at 19.9% [member]      
Disclosure of associates [line items]      
Net assets 52 55  
Adjustments to reflect capitalised costs, and additional rights and obligations under the shareholder agreement 7 10  
Carrying amount $ 59 $ 65