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FINANCIAL INSTRUMENTS - Summary of Derivatives (Details) - Dec. 31, 2018 bbl in Thousands, lb in Millions, K in Millions, $ in Millions | USD ($) lb bbl | PGK (K) lb bbl
--- | --- | ---
Interest rate contracts | Interest rate risk |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | $ | $ 42 |
Interest rate contracts | Interest rate risk | Hedge | Cash flow hedge |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | $ | 42 |
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 | $ | 14 |
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 | K |  | K 23
Currency swap contract | Currency risk | Hedge | Cash flow hedge |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | K |  | 0
Currency swap contract | Currency risk | Hedge | Fair value hedges |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | K |  | 0
Currency swap contract | Currency risk | Non-Hedge |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | K |  | 23
Currency swap contract | Less than 1 year | Currency risk |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | K |  | 23
Currency swap contract | 2 to 3 years | Currency risk |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | K |  | 0
Currency swap contract | 4 to 5 years | Currency risk |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amount | K |  | K 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 | 0 | 0
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 | 0 | 0
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 | 2 | 2
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
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 | 0 | 0
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
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
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 | 114 | 114
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 | 0 | 0
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 | (3,000) | (3,000)
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 | 114 | 114
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 | 114 | 114
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 | 0 | 0
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

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