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IMPAIRMENT OF GOODWILL AND OTHER ASSETS Narrative (Details) | 3 Months Ended | 6 Months Ended |  |  |  |
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Jun. 30, 2019 USD ($) Rate | Jun. 30, 2018 USD ($) | Jun. 30, 2019 USD ($) Rate | Jun. 30, 2018 USD ($) | Jul. 19, 2019 Rate shares | Jul. 18, 2019 USD ($) $ / shares Rate | May 21, 2019 USD ($) Rate shares | Sep. 28, 2018 Rate
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |  |  |  |  |  |
Impairment loss (impairment gain and reversal of impairment loss) determined in accordance with IFRS 9 | $ | $ 12,000,000 | $ 59,000,000 | $ 15,000,000 | $ 61,000,000 |  |  |  |
Percent of ownership request for consideration |  |  |  |  |  | 100.00% | 100.00% |
Lumwna mine [Member] |  |  |  |  |  |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |  |  |  |  |  |
Increase in royalty rate |  |  |  |  |  |  |  | 1.50%
Royalty on copper production |  |  |  |  |  |  |  | 10.00%
Duty on export |  |  |  |  |  |  |  | 5.00%
Acacia Mining PLC [Member] |  |  |  |  |  |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |  |  |  |  |  |
Impairment loss (impairment gain and reversal of impairment loss) determined in accordance with IFRS 9 | $ | $ 0 | $ 24,000,000 | $ 0 | $ 24,000,000 |  |  |  |
Share for share exchange | shares |  |  |  |  | 0.168 |  | 0.153 |
Percent of minority shareholder vote |  |  |  |  | 75.00% |  |  |
Market price | $ / shares |  |  |  |  |  | $ 17.22 |  |
Recoverable amount of asset or cash-generating unit | $ |  |  |  |  |  | $ 1.19 | $ 787,000,000 |
Proportion of ownership interests held by non-controlling interests |  |  | 36.10% |  |  |  |  |
Estimated Mineral Price For Measurement Of Fair Value Less Costs Of Disposal | $ |  |  | 1,250 |  |  |  |  |
Percent share in economic benefit | 50.00% |  | 50.00% |  |  |  |  |
Free carry interest in mines | 16.00% |  | 16.00% |  |  |  |  |
Acacia Mining PLC [Member] | Minimum [Member] |  |  |  |  |  |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |  |  |  |  |  |
Net assets value multiple | $ |  |  | $ 1.0 |  |  |  |  |
Weighted average cost of capital, significant unobservable inputs, assets |  |  | 6.50% |  |  |  |  |
Acacia Mining PLC [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |  |  |  |  |  |  |
Net assets value multiple | $ |  |  | $ 1.1 |  |  |  |  |
Weighted average cost of capital, significant unobservable inputs, assets |  |  | 6.90% |  |  |  |  |

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