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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, 2025
Dec. 31, 2024
Disclosure of risk management strategy related to hedge accounting [line items]    
Commodity derivatives outstanding $ 2,942 $ 2,496
Aluminum [member]    
Disclosure of risk management strategy related to hedge accounting [line items]    
Commodity derivatives outstanding 2,312 1,841
Energy [member]    
Disclosure of risk management strategy related to hedge accounting [line items]    
Commodity derivatives outstanding 212 207
Corn [member]    
Disclosure of risk management strategy related to hedge accounting [line items]    
Commodity derivatives outstanding 197 203
Plastic [member]    
Disclosure of risk management strategy related to hedge accounting [line items]    
Commodity derivatives outstanding 86 79
Sugar [member]    
Disclosure of risk management strategy related to hedge accounting [line items]    
Commodity derivatives outstanding 66 73
Wheat [member]    
Disclosure of risk management strategy related to hedge accounting [line items]    
Commodity derivatives outstanding 43 47
Rice [member]    
Disclosure of risk management strategy related to hedge accounting [line items]    
Commodity derivatives outstanding $ 26 $ 46