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FINANCIAL RISK MANAGEMENT - Narrative (Details)
ozt in Thousands, lb in Millions, bbl in Millions, $ in Millions
2 Months Ended 12 Months Ended
Feb. 28, 2018
ozt
Dec. 31, 2017
USD ($)
lb
ozt
bbl
Dec. 31, 2016
USD ($)
Commodity price risk      
Disclosure of detailed information about financial instruments [line items]      
Volume of fuel consumed in production process (in barrels) | bbl   4  
Commodity price risk | Copper      
Disclosure of detailed information about financial instruments [line items]      
Nominal amount of hedging instrument (gold, in ounces; copper, in pounds) | lb   60  
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   $ 10 $ 13
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   2,200  
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]      
Debt net of cash and equivalents   4,200 5,500
Undrawn borrowing facilities   $ 4,000  
Required ratio of debt to total capitalization   0.60  
Debt to total capitalization ratio, actual   0.27  
Liquidity risk | Borrowings      
Disclosure of detailed information about financial instruments [line items]      
Financial liabilities   $ 6,400 $ 7,900
Acacia | Commodity price risk | Gold      
Disclosure of detailed information about financial instruments [line items]      
Nominal amount of hedging instrument (gold, in ounces; copper, in pounds) | ozt   105  
Major purchases of assets | Acacia | Commodity price risk | Gold      
Disclosure of detailed information about financial instruments [line items]      
Purchase of put options | ozt 120