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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