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IMPAIRMENT AND REVERSAL OF NON-CURRENT ASSETS - Assumptions (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 USD ($) | Dec. 31, 2018 USD ($) $ / pound $ / ounce ozt Rate | Dec. 31, 2017 USD ($) $ / pound $ / ounce | Dec. 31, 2015 USD ($)
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 |  | 1.00% |  |
Impairment (reversals) charges |  | $ 900,000,000 | $ (212,000,000) |
Copper | Average |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |
WACC | 9.00% | 10.00% | 9.00% |
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 |  | 1,250 | 1,200 |
Estimated Change in Discount Rate Used In Current Measurement Of Fair Value Less Costs Of Disposal |  | 1.00% |  |
NAV multiple |  | 0.012 | 0.012 |
LOM year |  | 15 years | 17 years |
Gold[member] | Average |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |
NAV multiple |  | 1,050.000 | 1,200.000 |
WACC | 6.00% | 7.00% | 6.00% |
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 |  | 30 |  |
WACC | 3.00% | 3.00% | 3.00% |
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 |  | 55 |  |
WACC | 6.00% | 11.00% | 6.00% |
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 |  | 0.41 |  |
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 |  | 0.76 |  |
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 |  | 2.85 | 2.75 |
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% |  |
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 Increase in Gold Price | Pueblo Viejo | Gold[member] |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |
Impairment (reversals) charges |  | $ 607,000 |  |
$100 Increase in Gold Price | Hemlo1 [Member] | Gold[member] |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |
Impairment (reversals) charges |  | 0 |  |
$100 Increase in Gold Price | Veladero | Gold[member] |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |
Impairment (reversals) charges |  | (184,000,000) |  |
$100 Increase in Gold Price | Kalgoorlie [Member] | Gold[member] |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |
Impairment (reversals) charges |  | 0 |  |
$100 Decrease in Gold Price | Gold[member] |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |
Impairment (reversals) charges |  | $ (139,000) |  |
$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 |  |
$100 Decrease in Gold Price | Pueblo Viejo | Gold[member] |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |
Impairment (reversals) charges |  | (791,000) |  |
$100 Decrease in Gold Price | Veladero | Gold[member] |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |
Impairment (reversals) charges |  | 186,000,000 |  |
$100 Decrease in Gold Price | Kalgoorlie [Member] | Gold[member] |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |
Impairment (reversals) charges |  | $ (230,000) |  |
$0.25 increase in copper [Member] | Lumwana [Member] | 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) |  | 0.25 |  |
Impairment (reversals) charges |  | $ 573,000,000 |  |
$0.25 decrease in copper [Member] | Lumwana [Member] | 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 |  | 0.25 |  |
Impairment (reversals) charges |  | $ 426,000,000 |  |
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 |  | 746,000,000 |  |
Impairment (reversals) of long lived assets | Pueblo Viejo | Gold[member] | One percent decrease in WACC [Member] |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |
Impairment (reversals) charges |  | 540,000,000 |  | $ 0
Impairment (reversals) of long lived assets | Veladero | Gold[member] | One percent decrease in WACC [Member] |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |
Impairment (reversals) charges |  | $ 42,000,000 |  |
Individual assets or cash-generating units [member] | Lumwana [Member] |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |
Impairment (reversals) charges | $ (259,000,000) |  |  |
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 | $ 3,000,000 |
Estimated gold price |  | $ 1,200 |  |

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