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FINANCIAL INSTRUMENTS - Derivative Narrative (Details) ozt in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2018 USD ($) lb ozt bbl counterparty | Dec. 31, 2017 USD ($) | Dec. 31, 2018 AUD ($) lb ozt bbl counterparty | Dec. 31, 2016 bbl | Dec. 31, 2014 lb
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Number of counterparties | counterparty | 12 |  | 12 |  |
Unrealized gains (losses) on derivatives designated as cash flow hedges, net of tax ($11) and $3 | $ 8,000,000 | $ (16,000,000) |  |  |
Commodity price risk | Fuel contracts |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Notional amount (gold in ounces; copper in pounds; and fuel in barrels) | bbl | 114,000 |  | 114,000 |  |
Commodity price risk | Gold |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Notional amount (gold in ounces; copper in pounds; and fuel in barrels) | ozt | 205 |  | 205 |  |
Commodity price risk | Gold positions |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Notional amount (gold in ounces; copper in pounds; and fuel in barrels) | ozt | 35 |  | 35 |  |
Cash flow hedge |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Unrealized gains (losses) on derivatives designated as cash flow hedges, net of tax ($11) and $3 | $ 20,000,000 | (19,000,000) |  |  |
Hedge ineffectiveness due to changes in original forecasted transaction | 0 | 5,000,000 |  |  |
Interest rate contracts | Cash flow hedge |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Unrealized gains (losses) on derivatives designated as cash flow hedges, net of tax ($11) and $3 | (1,000,000) | 0 |  |  |
Hedge ineffectiveness due to changes in original forecasted transaction | 0 | 0 |  |  |
Interest rate contracts | Cash flow hedge | Interest rate risk |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Notional amount | 42,000,000 |  |  |  |
Currency contracts | Cash flow hedge | Currency risk |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Notional amount |  |  | $ 0 |  |
Fuel contracts | Cash flow hedge |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Unrealized gains (losses) on derivatives designated as cash flow hedges, net of tax ($11) and $3 | 4,000,000 | (8,000,000) |  |  |
Hedge ineffectiveness due to changes in original forecasted transaction | $ 0 | 5,000,000 |  |  |
WTI Fuel Contract | Cash flow hedge | 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 | 8,040,000 |
Silver | Cash flow hedge | Commodity price risk |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Unrealized gains (losses) on derivatives designated as cash flow hedges, net of tax ($11) and $3 | $ 190,000,000 |  |  |  |
Notional amount (gold in ounces; copper in pounds; and fuel in barrels) | lb |  |  |  |  | 65,000,000
Hedge ineffectiveness due to changes in original forecasted transaction | 0 |  |  |  |
Copper | Cash flow hedge |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Unrealized gains (losses) on derivatives designated as cash flow hedges, net of tax ($11) and $3 | 17,000,000 | (11,000,000) |  |  |
Hedge ineffectiveness due to changes in original forecasted transaction | $ 0 | $ 0 |  |  |
Copper | Cash flow hedge | 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 |  |
Derivatives purchased during period | lb | 44,000,000 |  |  |  |
Net Asset Position |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Number of counterparties | counterparty | 5 |  | 5 |  |
Derivative financial assets (liabilities) | $ 2,000,000 |  |  |  |
Net Liability Position |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Number of counterparties | counterparty | 7 |  | 7 |  |
Derivative financial assets (liabilities) | $ (2,000,000) |  |  |  |

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