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INCOME TAX EXPENSE Narrative (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure Of Major Components Of Tax Expense (Income) [Line Items]                
Current tax expense (income) $ 222   $ 103 $ 474 $ 233      
Deferred tax expense (income) 36   (62) 170 (25)      
Income tax expense (recovery) 258   $ 41 $ 644 $ 208      
Average effective tax rate       33.00%        
Adjusted effective tax rate       29.00%        
Tanzanian Mines                
Disclosure Of Major Components Of Tax Expense (Income) [Line Items]                
Proportion of ownership interests held by non-controlling interests   16.00%   16.00%        
Nevada Gold Mines [Member]                
Disclosure Of Major Components Of Tax Expense (Income) [Line Items]                
Proportion of ownership interests held by non-controlling interests       61.50%        
Argentina                
Disclosure Of Major Components Of Tax Expense (Income) [Line Items]                
Deferred tax expense (income)       $ 35        
Applicable tax rate       30.00%   30.00% 30.00% 35.00%
Tax on dividend distributions       13.00%   7.00% 7.00%  
Proposed corporate tax rate       25.00%        
Argentina | MALI                
Disclosure Of Major Components Of Tax Expense (Income) [Line Items]                
Net currency translation losses on deferred tax balances       $ 1        
TANZANIA, UNITED REPUBLIC OF                
Disclosure Of Major Components Of Tax Expense (Income) [Line Items]                
Current tax expense (income)   $ 21            
Deferred tax expense (income) $ 8 $ 44