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ACQUISITIONS AND DIVESTITURES - Business Combination of Newmont (Details) $ in Millions |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Jan. 01, 2020 | Mar. 10, 2019 | Sep. 30, 2019 USD ($) $ / bbl | Jun. 30, 2020 Rate | Dec. 31, 2019 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Jun. 30, 2019 USD ($)
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |
Proportion of ownership interests held by non-controlling interests | 16.00% |  |  |  |  |  |  |
Proportion of ownership interest in subsidiary |  |  |  |  |  | 100.00% |  |
Remeasurement of Turquoise Ridge to fair value (note 4) |  |  |  |  |  | $ 0 | $ (1,886) |
Acquisition-related costs for transaction recognised separately from acquisition of assets and assumption of liabilities in business combination |  |  |  |  |  | $ 0 | 18 |
Turquoise Ridge |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |
Proportion of ownership in joint operation | Rate |  |  |  | 75.00% |  |  |  |
Remeasurement of Turquoise Ridge to fair value (note 4) |  |  | $ 1,900 |  |  |  |  |
Barrick Nevada Mines [Member] |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |
Proportion of ownership interest in subsidiary | Rate |  |  |  | 100.00% |  |  |  |
Nevada Gold Mines |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |
Proportion of ownership interests held by non-controlling interests |  |  |  |  |  | 38.50% |  |
Proportion of ownership interest in subsidiary |  |  |  |  |  | 61.50% |  |
Mineral price (gold, in dollars per ounce; copper, in dollars per pound) | $ / bbl |  |  | 1,300 |  |  |  |  |
Newmont [Member] |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |
Percentage of voting equity interests acquired |  | 61.50% |  |  |  |  |  |
Proportion of ownership interests held by non-controlling interests |  | 38.50% |  |  |  |  |  |
Non-controlling interest in acquiree recognised at acquisition date |  |  | $ 1,645 |  |  |  |  | $ 2,440
Revenue of acquiree since acquisition date |  |  |  |  | $ 1,184 |  |  |
Profit (loss) of acquiree since acquisition date |  |  |  |  | $ 322 |  |  |
Revenue of combined entity as if combination occurred at beginning of period |  |  |  |  |  |  | 10,745 |
Profit (loss) of combined entity as if combination occurred at beginning of period |  |  |  |  |  |  | 4,500 |
Acquisition-related costs for transaction recognised separately from acquisition of assets and assumption of liabilities in business combination |  |  |  |  |  |  | $ 30 |

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