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Climate change - Summary of Climate Change in Asset Valuations Reflects (Detail)
Jul. 31, 2024
$ / tCO2
2030 Low [member] | Australia [member]  
Disclosure of Detailed Information About Carbon Credit Price [Line Items]  
Carbon Credit Price Per Ton 28
2030 Low [member] | Brazil [member]  
Disclosure of Detailed Information About Carbon Credit Price [Line Items]  
Carbon Credit Price Per Ton 6
2030 Low [member] | Chile [member]  
Disclosure of Detailed Information About Carbon Credit Price [Line Items]  
Carbon Credit Price Per Ton 9
2030 Low [member] | Canada [member]  
Disclosure of Detailed Information About Carbon Credit Price [Line Items]  
Carbon Credit Price Per Ton 71
2030 Low [member] | Key customer countries [member]  
Disclosure of Detailed Information About Carbon Credit Price [Line Items]  
Carbon Credit Price Per Ton 1
2030 High [member] | Australia [member]  
Disclosure of Detailed Information About Carbon Credit Price [Line Items]  
Carbon Credit Price Per Ton 83
2030 High [member] | Brazil [member]  
Disclosure of Detailed Information About Carbon Credit Price [Line Items]  
Carbon Credit Price Per Ton 55
2030 High [member] | Chile [member]  
Disclosure of Detailed Information About Carbon Credit Price [Line Items]  
Carbon Credit Price Per Ton 44
2030 High [member] | Canada [member]  
Disclosure of Detailed Information About Carbon Credit Price [Line Items]  
Carbon Credit Price Per Ton 110
2030 High [member] | Key customer countries [member]  
Disclosure of Detailed Information About Carbon Credit Price [Line Items]  
Carbon Credit Price Per Ton 193
2050 Low [member] | Australia [member]  
Disclosure of Detailed Information About Carbon Credit Price [Line Items]  
Carbon Credit Price Per Ton 166
2050 Low [member] | Brazil [member]  
Disclosure of Detailed Information About Carbon Credit Price [Line Items]  
Carbon Credit Price Per Ton 138
2050 Low [member] | Chile [member]  
Disclosure of Detailed Information About Carbon Credit Price [Line Items]  
Carbon Credit Price Per Ton 166
2050 Low [member] | Canada [member]  
Disclosure of Detailed Information About Carbon Credit Price [Line Items]  
Carbon Credit Price Per Ton 221
2050 Low [member] | Key customer countries [member]  
Disclosure of Detailed Information About Carbon Credit Price [Line Items]  
Carbon Credit Price Per Ton 28
2050 High [member] | Australia [member]  
Disclosure of Detailed Information About Carbon Credit Price [Line Items]  
Carbon Credit Price Per Ton 248
2050 High [member] | Brazil [member]  
Disclosure of Detailed Information About Carbon Credit Price [Line Items]  
Carbon Credit Price Per Ton 221
2050 High [member] | Chile [member]  
Disclosure of Detailed Information About Carbon Credit Price [Line Items]  
Carbon Credit Price Per Ton 248
2050 High [member] | Canada [member]  
Disclosure of Detailed Information About Carbon Credit Price [Line Items]  
Carbon Credit Price Per Ton 248
2050 High [member] | Key customer countries [member]  
Disclosure of Detailed Information About Carbon Credit Price [Line Items]  
Carbon Credit Price Per Ton 276