XML 406 R151.htm IDEA: XBRL DOCUMENT v3.19.3.a.u2
Other Financial Assets - Schedule of Other Financial Assets Parenthetical (Detail) - Financial assets at fair value through profit or loss, category [member] - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Disclosure of financial assets [line items]    
Financial assets measured at fair value through profit or loss $ 55 $ 100
Other financial assets [member]    
Disclosure of financial assets [line items]    
Financial assets measured at fair value through profit or loss 16 16
Trade Deposits And Loans [Member] | Other financial assets [member]    
Disclosure of financial assets [line items]    
Financial assets measured at fair value through profit or loss $ 3 $ 0