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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