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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, 2024
Dec. 31, 2023
Disclosure of risk management strategy related to hedge accounting [line items]    
Commodity derivatives outstanding $ 2,496 $ 2,719
Aluminum [member]    
Disclosure of risk management strategy related to hedge accounting [line items]    
Commodity derivatives outstanding 1,841 1,780
Energy [member]    
Disclosure of risk management strategy related to hedge accounting [line items]    
Commodity derivatives outstanding 207 249
Corn [member]    
Disclosure of risk management strategy related to hedge accounting [line items]    
Commodity derivatives outstanding 203 289
Plastic [member]    
Disclosure of risk management strategy related to hedge accounting [line items]    
Commodity derivatives outstanding 79 95
Sugar [member]    
Disclosure of risk management strategy related to hedge accounting [line items]    
Commodity derivatives outstanding 73 91
Wheat [member]    
Disclosure of risk management strategy related to hedge accounting [line items]    
Commodity derivatives outstanding 47 163
Rice [member]    
Disclosure of risk management strategy related to hedge accounting [line items]    
Commodity derivatives outstanding $ 46 $ 51