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FINANCIAL INSTRUMENTS - Summary of Derivatives (Details) - Dec. 31, 2017 ozt in Thousands, bbl in Thousands, lb in Millions, K in Millions, $ in Millions, $ in Millions, $ in Millions | CAD ($) lb ozt bbl | USD ($) lb ozt bbl | PGK (K) lb ozt bbl | AUD ($) lb ozt bbl
--- | --- | --- | --- | ---
Interest rate contracts | Interest rate risk |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Notional amount | $ |  | $ 71 |  |
Interest rate contracts | Interest rate risk | Hedge | Cash flow hedge |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Notional amount | $ |  | 71 |  |
Interest rate contracts | Interest rate risk | Hedge | Fair value hedges |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Notional amount | $ |  | 1 |  |
Interest rate contracts | Interest rate risk | Non-Hedge |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Notional amount | $ |  | 0 |  |
Interest rate contracts | Less than 1 year | Interest rate risk |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Notional amount | $ |  | 28 |  |
Interest rate contracts | 2 to 3 years | Interest rate risk |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Notional amount | $ |  | 43 |  |
Interest rate contracts | 4 to 5 years | Interest rate risk |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Notional amount | $ |  | $ 0 |  |
Currency swap contract | Currency risk |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Notional amount | $ 8 |  | K 32 | $ 21
Currency swap contract | Currency risk | Hedge | Cash flow hedge |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Notional amount | 0 |  | 0 | 0
Currency swap contract | Currency risk | Hedge | Fair value hedges |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Notional amount | 0 |  | 0 | 0
Currency swap contract | Currency risk | Non-Hedge |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Notional amount | 8 |  | 32 | 21
Currency swap contract | Less than 1 year | Currency risk |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Notional amount | 8 |  | 32 | 21
Currency swap contract | 2 to 3 years | Currency risk |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Notional amount | 0 |  | 0 | 0
Currency swap contract | 4 to 5 years | Currency risk |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Notional amount | $ 0 |  | K 0 | $ 0
Gold collar sell contracts | Commodity price risk |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Notional amount (gold in ounces; copper in pounds; and fuel in barrels) | ozt | 105 | 105 | 105 | 105
Gold collar sell contracts | Commodity price risk | Hedge | Cash flow hedge |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Notional amount (gold in ounces; copper in pounds; and fuel in barrels) | ozt | 0 | 0 | 0 | 0
Gold collar sell contracts | Commodity price risk | Hedge | Fair value hedges |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Notional amount (gold in ounces; copper in pounds; and fuel in barrels) | ozt | 2,000 | 2,000 | 2,000 | 2,000
Gold collar sell contracts | Commodity price risk | Non-Hedge |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Notional amount (gold in ounces; copper in pounds; and fuel in barrels) | ozt | 105 | 105 | 105 | 105
Gold collar sell contracts | Less than 1 year | Commodity price risk |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Notional amount (gold in ounces; copper in pounds; and fuel in barrels) | ozt | 105 | 105 | 105 | 105
Gold collar sell contracts | 2 to 3 years | Commodity price risk |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Notional amount (gold in ounces; copper in pounds; and fuel in barrels) | ozt | 0 | 0 | 0 | 0
Gold collar sell contracts | 4 to 5 years | Commodity price risk |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Notional amount (gold in ounces; copper in pounds; and fuel in barrels) | ozt | 0 | 0 | 0 | 0
Copper bought floor contracts | Commodity price risk |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Notional amount (gold in ounces; copper in pounds; and fuel in barrels) | lb | 60 | 60 | 60 | 60
Copper bought floor contracts | Commodity price risk | Hedge | Cash flow hedge |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Notional amount (gold in ounces; copper in pounds; and fuel in barrels) | lb | 60 | 60 | 60 | 60
Copper bought floor contracts | Commodity price risk | Hedge | Fair value hedges |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Notional amount (gold in ounces; copper in pounds; and fuel in barrels) | lb | (8) | (8) | (8) | (8)
Copper bought floor contracts | Commodity price risk | Non-Hedge |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Notional amount (gold in ounces; copper in pounds; and fuel in barrels) | lb | 0 | 0 | 0 | 0
Copper bought floor contracts | Less than 1 year | Commodity price risk |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Notional amount (gold in ounces; copper in pounds; and fuel in barrels) | lb | 60 | 60 | 60 | 60
Copper bought floor contracts | 2 to 3 years | Commodity price risk |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Notional amount (gold in ounces; copper in pounds; and fuel in barrels) | lb | 0 | 0 | 0 | 0
Copper bought floor contracts | 4 to 5 years | Commodity price risk |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Notional amount (gold in ounces; copper in pounds; and fuel in barrels) | lb | 0 | 0 | 0 | 0
Fuel contracts | Commodity price risk |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Notional amount (gold in ounces; copper in pounds; and fuel in barrels) | bbl | 1,286 | 1,286 | 1,286 | 1,286
Fuel contracts | Commodity price risk | Hedge | Cash flow hedge |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Notional amount (gold in ounces; copper in pounds; and fuel in barrels) | bbl | 840 | 840 | 840 | 840
Fuel contracts | Commodity price risk | Hedge | Fair value hedges |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Notional amount (gold in ounces; copper in pounds; and fuel in barrels) | bbl | (24,000) | (24,000) | (24,000) | (24,000)
Fuel contracts | Commodity price risk | Non-Hedge |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Notional amount (gold in ounces; copper in pounds; and fuel in barrels) | bbl | 446 | 446 | 446 | 446
Fuel contracts | Less than 1 year | Commodity price risk |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Notional amount (gold in ounces; copper in pounds; and fuel in barrels) | bbl | 1,244 | 1,244 | 1,244 | 1,244
Fuel contracts | 2 to 3 years | Commodity price risk |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Notional amount (gold in ounces; copper in pounds; and fuel in barrels) | bbl | 42 | 42 | 42 | 42
Fuel contracts | 4 to 5 years | Commodity price risk |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |
Notional amount (gold in ounces; copper in pounds; and fuel in barrels) | bbl | 0 | 0 | 0 | 0

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