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PROVISIONS - Narrative (Details) - Environmental rehabilitation $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 USD ($) | Dec. 31, 2020 USD ($)
Disclosure of other provisions [line items] |  |
Increase in other provisions | $ (121) | $ 3
Discount rate change (as percent) |  | 1.00%
Expected decrease in other provisions with 1% increase in discount rate |  | $ (374)
Expected increase in other provisions with 1% decrease in discount rate |  | $ 0
Discount rate applied to cash flow projections | 0.00% | 0.00%

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