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FINANCIAL RISK MANAGEMENT - Narrative (Details) bbl in Millions, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 USD ($) oz bbl | Dec. 31, 2019 USD ($) oz | Dec. 31, 2018 USD ($)
Disclosure of detailed information about financial instruments [line items] |  |  |
Ounces of gold purchased for collars | oz | 57,000 | 0 |
Borrowings | $ 5,155 | $ 5,536 | $ 5,738
Debt to total capitalization ratio, actual | 0.00 |  |
Commodity price risk |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Volume of fuel consumed in production process (in barrels) | bbl | 4 |  |
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 | $ 30 | 18 |
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] |  |  |
Borrowings | 5,200 | 5,500 |
Debt net of cash and equivalents | (33) | $ 2,200 |
Undrawn borrowing facilities | $ 3,000 |  |
Required ratio of debt to total capitalization | 0.60 |  |

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