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v3.21.1

Provisions - Schedule of Assumption in Provision Calculation (Detail) | Dec. 31, 2020 | Dec. 31, 2019
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South Africa [member] |  |
Disclosure of Provisions [line items] |  |
Inflation rate | 4.80% | 5.40%
Discount rate | 10.80% | 10.30%
Ghana [member] |  |
Disclosure of Provisions [line items] |  |
Inflation rate | 2.20% | 2.50%
Australia [member] |  |
Disclosure of Provisions [line items] |  |
Inflation rate | 2.50% | 2.50%
Discount rate | 2.50% |
Peru [member] |  |
Disclosure of Provisions [line items] |  |
Inflation rate | 2.20% | 2.50%
Discount rate | 2.20% | 3.00%
CHILE |  |
Disclosure of Provisions [line items] |  |
Inflation rate | 2.20% | 2.50%
Discount rate | 2.20% | 2.60%
Bottom of range [member] | Ghana [member] |  |
Disclosure of Provisions [line items] |  |
Discount rate | 6.70% | 7.70%
Bottom of range [member] | Australia [member] |  |
Disclosure of Provisions [line items] |  |
Discount rate |  | 1.20%
Top of range [member] | Ghana [member] |  |
Disclosure of Provisions [line items] |  |
Discount rate | 7.20% | 7.90%
Top of range [member] | Australia [member] |  |
Disclosure of Provisions [line items] |  |
Discount rate |  | 1.60%

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