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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
Dec. 31, 2023
Dec. 31, 2022
Disclosure of risk management strategy related to hedge accounting [line items]    
Commodity derivatives outstanding $ 2,719 $ 3,348
Aluminum [member]    
Disclosure of risk management strategy related to hedge accounting [line items]    
Commodity derivatives outstanding 1,780 2,165
Energy [member]    
Disclosure of risk management strategy related to hedge accounting [line items]    
Commodity derivatives outstanding 249 417
Corn [member]    
Disclosure of risk management strategy related to hedge accounting [line items]    
Commodity derivatives outstanding 289 321
Wheat [member]    
Disclosure of risk management strategy related to hedge accounting [line items]    
Commodity derivatives outstanding 163 127
Rice [member]    
Disclosure of risk management strategy related to hedge accounting [line items]    
Commodity derivatives outstanding 51 100
Plastic [member]    
Disclosure of risk management strategy related to hedge accounting [line items]    
Commodity derivatives outstanding 95 122
Sugar [member]    
Disclosure of risk management strategy related to hedge accounting [line items]    
Commodity derivatives outstanding $ 91 $ 95