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Risks Arising From Financial Instruments - Disclosure of Financial Assets (Detail) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Disclosure of financial assets [line items]    
Non-current $ 914 $ 883
Current 4,885 5,126
Trade receivables [member]    
Disclosure of financial assets [line items]    
Trade and other receivables 4,741 5,444
Equity instruments [member]    
Disclosure of financial assets [line items]    
Unquoted debt 21 25
Unquoted companies 92 85
Quoted debt [member]    
Disclosure of financial assets [line items]    
Debt instruments at fair value through profit or loss 102 91
Derivatives not designated [member] | Equity swaps [member]    
Disclosure of financial assets [line items]    
Debt instruments at fair value through profit or loss 5 17
Derivatives not designated [member] | Interest rate swap [member]    
Disclosure of financial assets [line items]    
Debt instruments at fair value through profit or loss 101 18
Derivatives not designated [member] | Cross currency interest rate swaps [Member]    
Disclosure of financial assets [line items]    
Debt instruments at fair value through profit or loss 275 157
Derivatives designated [member]    
Disclosure of financial assets [line items]    
Total 5,799 6,009
Derivatives designated [member] | Forward exchange contracts [member]    
Disclosure of financial assets [line items]    
Debt instruments at fair value through profit or loss 437 112
Derivatives designated [member] | Foreign currency futures [Member]    
Disclosure of financial assets [line items]    
Debt instruments at fair value through profit or loss 1 7
Derivatives designated [member] | Other commodity derivatives [Member]    
Disclosure of financial assets [line items]    
Debt instruments at fair value through profit or loss $ 24 $ 52