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ACQUISITIONS AND DIVESTITURES - Acquisition of Acacia (Details) - USD ($) $ in Millions |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Jan. 01, 2020 | Sep. 17, 2019 | Dec. 31, 2020 | Sep. 30, 2020 | Dec. 31, 2019 | Sep. 30, 2020 | Dec. 31, 2020
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%
Government of Tanzania |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |
Proportion of ownership interests held by non-controlling interests |  |  |  |  |  |  | 16.00%
Acacia Mining PLC |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |
Proportion of ownership interests held by non-controlling interests |  | 36.10% |  |  |  |  |
Share for share exchange |  | 0.168 |  |  |  |  |
Number of shares issued |  | 24,836,670 |  |  |  |  |
Proportion of interest held by shareholders |  | 1.00% |  |  |  |  |
Increase (decrease) through change in equity of subsidiaries, equity |  |  |  | $ 70 |  |  |
Proportion of ownership interest in subsidiary |  |  | 100.00% |  | 100.00% | 63.90% | 84.00%

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