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Provisions - Schedule of Assumption in Provision Calculation (Detail)
Dec. 31, 2023
Dec. 31, 2022
South Africa    
Disclosure of Provisions [line items]    
Discount rate 12.10% 11.40%
South Africa | Inflation rate Year 1    
Disclosure of Provisions [line items]    
Inflation rate Year 4 onwards 5.00% 5.30%
South Africa | Inflation rate Year 2    
Disclosure of Provisions [line items]    
Inflation rate Year 4 onwards 4.60% 4.70%
South Africa | Inflation rate Year 3    
Disclosure of Provisions [line items]    
Inflation rate Year 4 onwards 4.50% 4.60%
South Africa | Inflation rate Year 4 onwards    
Disclosure of Provisions [line items]    
Inflation rate Year 4 onwards 4.50% 4.60%
Ghana | Inflation rate Year 1    
Disclosure of Provisions [line items]    
Inflation rate Year 4 onwards 2.70% 3.40%
Ghana | Inflation rate Year 2    
Disclosure of Provisions [line items]    
Inflation rate Year 4 onwards 2.50% 2.60%
Ghana | Inflation rate Year 3    
Disclosure of Provisions [line items]    
Inflation rate Year 4 onwards 2.30% 2.40%
Ghana | Inflation rate Year 4 onwards    
Disclosure of Provisions [line items]    
Inflation rate Year 4 onwards 2.30% 2.40%
Australia | Inflation rate Year 1    
Disclosure of Provisions [line items]    
Inflation rate Year 4 onwards 3.80% 4.80%
Australia | Inflation rate Year 2    
Disclosure of Provisions [line items]    
Inflation rate Year 4 onwards 3.30% 2.90%
Australia | Inflation rate Year 3    
Disclosure of Provisions [line items]    
Inflation rate Year 4 onwards 2.80% 2.70%
Australia | Inflation rate Year 4 onwards    
Disclosure of Provisions [line items]    
Inflation rate Year 4 onwards 2.60% 2.50%
Peru    
Disclosure of Provisions [line items]    
Discount rate 5.20% 5.40%
Peru | Inflation rate Year 1    
Disclosure of Provisions [line items]    
Inflation rate Year 4 onwards 2.70% 3.40%
Peru | Inflation rate Year 2    
Disclosure of Provisions [line items]    
Inflation rate Year 4 onwards 2.50% 2.60%
Peru | Inflation rate Year 3    
Disclosure of Provisions [line items]    
Inflation rate Year 4 onwards 2.30% 2.40%
Peru | Inflation rate Year 4 onwards    
Disclosure of Provisions [line items]    
Inflation rate Year 4 onwards 2.30% 2.40%
Chile    
Disclosure of Provisions [line items]    
Discount rate 4.60% 4.70%
Chile | Inflation rate Year 1    
Disclosure of Provisions [line items]    
Inflation rate Year 4 onwards 2.70% 3.40%
Chile | Inflation rate Year 2    
Disclosure of Provisions [line items]    
Inflation rate Year 4 onwards 2.50% 2.60%
Chile | Inflation rate Year 3    
Disclosure of Provisions [line items]    
Inflation rate Year 4 onwards 2.30% 2.40%
Chile | Inflation rate Year 4 onwards    
Disclosure of Provisions [line items]    
Inflation rate Year 4 onwards 2.30% 2.40%
Bottom of range | Ghana    
Disclosure of Provisions [line items]    
Discount rate 12.10% 15.00%
Bottom of range | Australia    
Disclosure of Provisions [line items]    
Discount rate 4.00% 4.00%
Top of range | Ghana    
Disclosure of Provisions [line items]    
Discount rate 12.40% 15.20%
Top of range | Australia    
Disclosure of Provisions [line items]    
Discount rate 4.20% 4.30%