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Risks arising from Financial instruments - Schedule of Commodity Derivatives Outstanding (Detail) - Commodity price risk [member] - Commodity derivatives [member] - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Disclosure of risk management strategy related to hedge accounting [line items]    
Commodity derivatives outstanding $ 1,964 $ 2,360
Aluminum swap [member]    
Disclosure of risk management strategy related to hedge accounting [line items]    
Commodity derivatives outstanding 1,342 1,449
Exchange traded sugar futures [member]    
Disclosure of risk management strategy related to hedge accounting [line items]    
Commodity derivatives outstanding 57 54
Natural gas and energy derivatives [member]    
Disclosure of risk management strategy related to hedge accounting [line items]    
Commodity derivatives outstanding 150 256
Corn swaps [member]    
Disclosure of risk management strategy related to hedge accounting [line items]    
Commodity derivatives outstanding 202 195
Exchange traded wheat futures [member]    
Disclosure of risk management strategy related to hedge accounting [line items]    
Commodity derivatives outstanding 7 20
Rice swaps [member]    
Disclosure of risk management strategy related to hedge accounting [line items]    
Commodity derivatives outstanding 168 328
Plastic derivatives [member]    
Disclosure of risk management strategy related to hedge accounting [line items]    
Commodity derivatives outstanding $ 38 $ 59