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INCOME TAX EXPENSE - Narrative (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure Of Major Components Of Tax Expense (Income) [Line Items] |  |  |  |  |
Tax Effect of peso and CFA franc Exchange Differences |  | $ 19,000,000 | $ 75,000,000 |  |
Applicable tax rate |  | 26.50% | 26.50% |  |
Dividends withholdings taxes |  | $ 87,000,000 |  |  |
Proportion of ownership interest in subsidiary |  | 100.00% |  |  |
Current tax expense (income) |  | $ 1,122,000,000 | $ 685,000,000 |  |
Nevada Gold Mines [Member] |  |  |  |  |
Disclosure Of Major Components Of Tax Expense (Income) [Line Items] |  |  |  |  |
Proportion of ownership interest in subsidiary |  | 61.50% |  |  |
TANZANIA, UNITED REPUBLIC OF |  |  |  |  |
Disclosure Of Major Components Of Tax Expense (Income) [Line Items] |  |  |  |  |
Deferred tax expense (income) |  | $ 43,000,000 |  |  |
Current tax expense (income) |  | 20,000,000 |  |  |
TANZANIA, UNITED REPUBLIC OF | Buzwagi [Member] |  |  |  |  |
Disclosure Of Major Components Of Tax Expense (Income) [Line Items] |  |  |  |  |
Deferred tax expense (income) |  | $ 40,000,000 |  |  |
ARGENTINA |  |  |  |  |
Disclosure Of Major Components Of Tax Expense (Income) [Line Items] |  |  |  |  |
Applicable tax rate |  | 30.00% | 30.00% | 30.00% | 35.00%
Proposed tax rate |  | 25.00% |  |  |
Tax on dividend distributions |  | 13.00% | 7.00% | 7.00% |
Deferred tax expense (income) | $ 35,000,000 |  |  |  |

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