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v3.20.1

IMPAIRMENT AND REVERSAL OF NON-CURRENT ASSETS - Narrative (Details) |  |  |  |  | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended |  |  |
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Jan. 24, 2020 Rate | Jan. 01, 2020 Rate | Sep. 17, 2019 Rate shares | Oct. 19, 2017 | Dec. 31, 2019 USD ($) Rate | Sep. 30, 2019 Rate | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) Rate | Jun. 30, 2019 USD ($) Rate | Jun. 30, 2018 USD ($) $ / ounce Rate | Dec. 31, 2017 | Jun. 30, 2017 | Sep. 30, 2019 Rate | Sep. 16, 2019 | Dec. 31, 2019 USD ($) $ / ounce ozt Rate | Dec. 31, 2018 USD ($) $ / ounce | Jul. 19, 2019 shares | May 21, 2019 USD ($) Rate shares | Sep. 28, 2018 Rate
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 |  |  |
Percent of ownership request for consideration | Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |
Proportion of ownership interests held by non-controlling interests |  | 16.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-current 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 |  |  |
Goodwill |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment (reversals) charges |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 154,000,000 |  |  |
Nevada Gold Mines [Member] | Individual assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment (reversals) charges |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 60,000,000 |  |  |  |
Acacia Mining PLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share for share exchange | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.168 | 0.153 |
Proportion of ownership interests held by non-controlling interests | Rate |  |  |  |  |  |  |  |  | 36.10% |  |  |  |  |  |  |  |  |  |
Estimated Mineral Price For Measurement Of Fair Value Less Costs Of Disposal |  |  |  |  |  |  |  |  | 1,250 |  |  |  |  |  |  |  |  |  |
Percent share in economic benefit | Rate |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |
Recoverable amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 787,000,000 |
Veladero |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Duty on export | Rate |  |  |  |  | 12.00% |  |  |  |  |  |  |  |  |  | 12.00% |  |  |  |
Capped price per USD export |  |  |  |  | $ 4.00 |  |  |  |  |  |  |  |  |  | $ 4.00 |  |  |  |
Veladero | Individual assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment (reversals) charges |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,000,000 | 246,000,000 |  |  |
Gains (losses) on subsequent increase in fair value less costs to sell not in excess of recognised cumulative impairment loss or write-down to fair value less costs to sell |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 674,000,000 |  |  |  |
Veladero | Goodwill |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment (reversals) charges |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | 154,000,000 |  |  |
Percentage of entity's revenue | Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.50% |  |  |  |
Lagunas Norte | Individual assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Discount rate used in current measurement of fair value less costs of disposal | Rate |  |  |  |  | 3.80% |  |  |  |  |  |  |  |  |  | 3.80% |  |  |  |
Impairment (reversals) charges |  |  |  |  |  |  | $ 405,000,000 |  |  |  |  |  |  |  | $ 12,000,000 | 405,000,000 |  |  |
Fair Value Less Cost of Disposal |  |  |  |  |  |  | $ 150,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Estimated gold price |  |  |  |  | $ 1,200 |  |  |  |  |  |  |  |  |  | 1,200 |  |  |  |
Lagunas Norte | Inventories [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  | 1,250 |  |  |  |
Lumwana | Individual assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment (reversals) charges |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (947,000,000) | 0 |  |  |
Fair Value Less Cost of Disposal |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,400,000,000 |  |  |  |
Weighted average cost of capital, significant unobservable inputs, assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.40% |  |  |  |
Pueblo Viejo | Individual assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment (reversals) charges |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (865,000,000) | $ 0 |  |  |
Risk Premium used for adjustment due to non-financial risk |  |  |  |  | 2.00% |  |  |  |  |  |  |  |  |  | 2.00% |  |  |  |
Gold[member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated Mineral Price For Measurement Of Fair Value Less Costs Of Disposal | $ / ounce |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,300 | 1,250 |  |  |
Pascua-Lama | Individual assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment (reversals) charges |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 296,000,000 |  |  |  |
Estimated Mineral Price For Measurement Of Fair Value Less Costs Of Disposal |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 398,000,000 |  |  |  |
Lumwana |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in royalty rate | Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.50%
Royalty on copper production | Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.00%
Change in royalty rate | Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.50% |  |  |  |
Duty on export | Rate |  |  |  |  | 5.00% |  |  |  |  |  |  |  |  |  | 5.00% |  |  |  | 5.00%
Royalty tax rate | Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.00% |  |  |  |
Lumwana | Copper |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated change in mineral price (gold, in dollars per ounce; copper, in dollars per pound) | Rate |  |  |  |  |  | 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] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Discount rate used in current measurement of fair value less costs of disposal | Rate |  |  |  |  | 11.00% |  |  |  |  |  |  |  |  |  | 11.00% |  |  |  |
Share for share exchange | shares |  |  | 0.168 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interests held by non-controlling interests |  |  | 36.10% |  |  |  |  |  |  |  |  |  |  |  | 0.00% |  |  |  |
Estimated Mineral Price For Measurement Of Fair Value Less Costs Of Disposal |  |  |  |  |  |  |  |  |  | 1,200 |  |  |  |  |  |  |  |  |
Proportion of Ownership Interest Sold | Rate | 16.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest in subsidiary |  | 84.00% | 100.00% |  | 100.00% |  |  |  |  |  |  |  | 63.90% | 63.90% |  |  |  |  |
Pueblo Viejo |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interests held by non-controlling interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 40.00% |  |  |  |
Proportion of ownership interest in subsidiary |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 60.00% |  |  |  |
Minimum | Gold[member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Discount rate used in current measurement of fair value less costs of disposal |  |  |  |  | 3.00% |  |  |  |  |  |  |  |  |  | 3.00% | 4.00% |  |  |
Estimated Mineral Price For Measurement Of Fair Value Less Costs Of Disposal | ozt |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20 |  |  |  |
Maximum | Gold[member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Discount rate used in current measurement of fair value less costs of disposal |  |  |  |  | 7.00% |  |  |  |  |  |  |  |  |  | 7.00% | 11.00% |  |  |
Estimated Mineral Price For Measurement Of Fair Value Less Costs Of Disposal | ozt |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 30 |  |  |  |
$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] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated change in mineral price (gold, in dollars per ounce; copper, in dollars per pound) | $ / ounce |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100 |  |  |  |
Estimated Fair Value of Asset Impairment |  |  |  |  | $ 529,000,000 |  |  |  |  |  |  |  |  |  | $ 529,000,000 |  |  |  |
$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] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment (reversals) charges |  |  |  |  |  |  |  |  |  | $ 98 |  |  |  |  |  |  |  |  |
Estimated Mineral Price For Measurement Of Fair Value Less Costs Of Disposal | $ / ounce |  |  |  |  |  |  |  |  |  | 100 |  |  |  |  |  |  |  |  |
$0.25 increase in copper |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated Fair Value of Asset Impairment |  |  |  |  | 390,000,000 |  |  |  |  |  |  |  |  |  | $ 390,000,000 |  |  |  |
$100 Increase in Gold Price | Gold[member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated change in mineral price (gold, in dollars per ounce; copper, in dollars per pound) | $ / ounce |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100 |  |  |  |
Estimated Fair Value of Asset Impairment |  |  |  |  | 246,000,000 |  |  |  |  |  |  |  |  |  | $ 246,000,000 |  |  |  |
$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] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated Mineral Price For Measurement Of Fair Value Less Costs Of Disposal | $ / ounce |  |  |  |  |  |  |  |  |  | 100 |  |  |  |  |  |  |  |  |
Estimated change in WACC (as percent) | Rate |  |  |  |  |  |  |  |  |  | 1.00% |  |  |  |  |  |  |  |  |
$0.25 decrease in copper |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated Mineral Price For Measurement Of Fair Value Less Costs Of Disposal | $ / ounce |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |
Estimated Fair Value of Asset Impairment |  |  |  |  | 390,000,000 |  |  |  |  |  |  |  |  |  | $ 390,000,000 |  |  |  |
Negative Ten Percent change in Gold and Silver [Member] | Pascua-Lama |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated Mineral Price For Measurement Of Fair Value Less Costs Of Disposal | $ / ounce |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |
Estimated Fair Value of Asset Impairment |  |  |  |  | 40,000,000 |  |  |  |  |  |  |  |  |  | $ 40,000,000 |  |  |  |
Increase/decrease in gold/copper price [Member] | Copper |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated change in mineral price (gold, in dollars per ounce; copper, in dollars per pound) | $ / ounce |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.25 |  |  |  |
Increase/decrease in gold/copper price [Member] | Gold[member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated change in mineral price (gold, in dollars per ounce; copper, in dollars per pound) | $ / ounce |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100 |  |  |  |
Cash-generating units | Bulyanhulu |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Recoverable amount |  |  |  |  | 579,000,000 |  |  |  |  |  |  |  |  |  | $ 579,000,000 |  |  |  |
Cash-generating units | Lumwana |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Recoverable amount |  |  |  |  | $ 1,307,000,000 |  |  |  |  |  |  |  |  |  | $ 1,307,000,000 |  |  |  |
Tax contingent liability [member] | Tanzanian Revenue Authority Assessment | Acacia Mining PLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Economic Benefit Shared With Government | 5000.00% |  |  | 5000.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interests held by non-controlling interests |  |  |  | 16.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Royalty tax rate |  |  |  |  |  |  |  |  |  |  | 4.00% | 6.00% |  |  |  |  |  |  |
Clearing fee on minerals exported |  |  |  |  |  |  |  |  |  |  | 1.00% |  |  |  |  |  |  |  |
OreCorp [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment (reversals) charges |  |  |  |  |  |  |  | $ 24 |  |  |  |  |  |  |  |  |  |  |
Recoverable amount |  |  |  |  |  |  |  | 10 |  | $ 10 |  |  |  |  |  |  |  |  |
Proportion of Ownership Interest Sold | Rate |  |  |  |  |  |  |  |  |  | 51.00% |  |  |  |  |  |  |  |  |
Future consideration to be received |  |  |  |  |  |  |  | 7 |  | $ 7 |  |  |  |  |  |  |  |  |
Net smelter royalty capped |  |  |  |  |  |  |  | 15 |  | $ 15 |  |  |  |  |  |  |  |  |
Proportion of ownership in joint operation | Rate |  |  |  |  |  |  |  |  |  | 49.00% |  |  |  |  |  |  |  |  |
Consideration paid (received) |  |  |  |  |  |  |  |  |  | $ 3 |  |  |  |  |  |  |  |  |
Kabanga [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment (reversals) charges |  |  |  |  |  |  |  | $ 30,000,000 |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest in associate | Rate |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |
One percent decrease in WACC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average cost of capital, significant unobservable inputs, assets | Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.00% |  |  |  |
One percent increase in WACC [Member] | Acacia Mining PLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated change in WACC (as percent) | Rate |  |  |  |  |  |  |  |  |  | 1.00% |  |  |  |  |  |  |  |  |
One percent increase/decrease in WACC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average cost of capital, significant unobservable inputs, assets | Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.00% |  |  |  |
Minimum | Acacia Mining PLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net assets value multiple |  |  |  |  |  |  |  |  | $ 1.0 |  |  |  |  |  |  |  |  |  |
Weighted average cost of capital, significant unobservable inputs, assets | Rate |  |  |  |  |  |  |  |  | 6.50% |  |  |  |  |  |  |  |  |  |
Maximum | Acacia Mining PLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net assets value multiple |  |  |  |  |  |  |  |  | $ 1.1 |  |  |  |  |  |  |  |  |  |
Weighted average cost of capital, significant unobservable inputs, assets | Rate |  |  |  |  |  |  |  |  | 6.90% |  |  |  |  |  |  |  |  |  |

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