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FINANCIAL RISK MANAGEMENT - Narrative (Details)
ozt in Thousands, bbl in Millions, $ in Millions
12 Months Ended
Dec. 31, 2018
USD ($)
ozt
bbl
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Disclosure of detailed information about financial instruments [line items]      
Borrowings $ 5,738 $ 6,423 $ 7,931
Debt to total capitalization ratio, actual 0.31    
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 $ 16 0  
Reasonably possible change in risk variable, impact on net earnings 10 13  
Interest rate risk | Cash and equivalents      
Disclosure of detailed information about financial instruments [line items]      
Financial assets 1,600    
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 6,000 6,000  
Debt net of cash and equivalents 4,000 $ 4,000  
Undrawn borrowing facilities $ 3,000    
Required ratio of debt to total capitalization 0.60    
Acacia Mining PLC | Commodity price risk | Gold[member]      
Disclosure of detailed information about financial instruments [line items]      
Nominal amount of hedging instrument (gold, in ounces; copper, in pounds) | ozt 35