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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 |  |

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