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IMPAIRMENT AND REVERSAL OF NON-CURRENT ASSETS - Assumptions (Details) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) $ / ounce Rate | Dec. 31, 2019 USD ($) $ / ounce ozt $ / pound Rate | Dec. 31, 2018 USD ($) $ / ounce $ / pound
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |
Impairment (reversals) charges |  |  | $ (1,423,000,000) | $ 900,000,000
Copper | Average |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |
WACC |  |  |  | 10.00%
Gold[member] |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |
Mineral price (gold, in dollars per ounce; copper, in dollars per pound) | $ / ounce |  |  | 1,300 | 1,250
LOM year |  |  | 19 years | 15 years
Gold[member] | Average |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |
NAV multiple |  |  | 1,200.000 | 1,050.000
WACC |  |  | 4.00% | 7.00%
Gold[member] | Minimum |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |
Mineral price (gold, in dollars per ounce; copper, in dollars per pound) | ozt |  |  | 20 |
WACC |  |  | 3.00% | 4.00%
Gold[member] | Maximum |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |
Mineral price (gold, in dollars per ounce; copper, in dollars per pound) | ozt |  |  | 30 |
WACC |  |  | 7.00% | 11.00%
Silver | Minimum |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |
Mineral price (gold, in dollars per ounce; copper, in dollars per pound) | ozt |  |  | 0.28 |
Silver | Maximum |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |
Mineral price (gold, in dollars per ounce; copper, in dollars per pound) | ozt |  |  | 0.42 |
Long-term | Copper |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |
Mineral price (gold, in dollars per ounce; copper, in dollars per pound) | $ / pound |  |  | 3.00 | 2.85
Acacia Mining PLC |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |
Mineral price (gold, in dollars per ounce; copper, in dollars per pound) |  | 1,200 |  |
WACC | Rate |  |  | 11.00% |
Acacia Mining PLC | One percent increase in WACC [Member] |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |
Estimated Change in Discount Rate Used In Current Measurement Of Fair Value Less Costs Of Disposal | Rate |  | 1.00% |  |
Lagunas Norte | Minimum |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |
NAV multiple |  |  | 1.100 |
Lagunas Norte | Maximum |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |
NAV multiple |  |  | 1.200 |
$100 Increase in Gold Price | Acacia Mining PLC |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |
Mineral price (gold, in dollars per ounce; copper, in dollars per pound) | $ / ounce |  | 100 |  |
Estimated Change in Discount Rate Used In Current Measurement Of Fair Value Less Costs Of Disposal | Rate |  | 1.00% |  |
$100 Decrease in Gold Price | Acacia Mining PLC |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |
Mineral price (gold, in dollars per ounce; copper, in dollars per pound) | $ / ounce |  | 100 |  |
Impairment (reversals) charges |  | $ 98 |  |
$0.25 decrease in copper |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |
Mineral price (gold, in dollars per ounce; copper, in dollars per pound) | $ / ounce |  |  | 0 |
Other impaired assets [member] | Lagunas Norte |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |
Impairment (reversals) charges |  |  | $ 166,000,000 |
Estimated gold price |  |  | 1,250 |
Impairment (reversals) of long lived assets |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |
Impairment (reversals) charges |  |  | $ (1,423,000,000) | $ 746,000,000
Individual assets or cash-generating units [member] | Lagunas Norte |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |
WACC | Rate |  |  | 3.80% |
Impairment (reversals) charges | $ 405,000,000 |  | $ 12,000,000 | $ 405,000,000
Estimated gold price |  |  | $ 1,200 |

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