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FINANCIAL RISK MANAGEMENT - Narrative (Details)
bbl in Millions, $ in Millions
12 Months Ended
Dec. 31, 2020
USD ($)
oz
bbl
Dec. 31, 2019
USD ($)
oz
Dec. 31, 2018
USD ($)
Disclosure of detailed information about financial instruments [line items]      
Ounces of gold purchased for collars | oz 57,000 0  
Borrowings $ 5,155 $ 5,536 $ 5,738
Debt to total capitalization ratio, actual 0.00    
Commodity price risk      
Disclosure of detailed information about financial instruments [line items]      
Volume of fuel consumed in production process (in barrels) | bbl 4    
Interest rate risk      
Disclosure of detailed information about financial instruments [line items]      
Reasonably possible change in risk variable, percent 1.00%    
Reasonably possible change in risk variable, impact on equity $ 30 18  
Interest rate risk | Borrowings | Variable rate      
Disclosure of detailed information about financial instruments [line items]      
Financial liabilities 100    
Liquidity risk      
Disclosure of detailed information about financial instruments [line items]      
Borrowings 5,200 5,500  
Debt net of cash and equivalents (33) $ 2,200  
Undrawn borrowing facilities $ 3,000    
Required ratio of debt to total capitalization 0.60