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INCOME TAX EXPENSE Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure Of Major Components Of Tax Expense (Income) [Line Items] |  |  |  |  |  |  |  |
Current tax expense (income) | $ 222 |  | $ 103 | $ 474 | $ 233 |  |  |
Deferred tax expense (income) | 36 |  | (62) | 170 | (25) |  |  |
Income tax expense (recovery) | 258 |  | $ 41 | $ 644 | $ 208 |  |  |
Average effective tax rate |  |  |  | 33.00% |  |  |  |
Adjusted effective tax rate |  |  |  | 29.00% |  |  |  |
Tanzanian Mines |  |  |  |  |  |  |  |
Disclosure Of Major Components Of Tax Expense (Income) [Line Items] |  |  |  |  |  |  |  |
Proportion of ownership interests held by non-controlling interests |  | 16.00% |  | 16.00% |  |  |  |
Nevada Gold Mines [Member] |  |  |  |  |  |  |  |
Disclosure Of Major Components Of Tax Expense (Income) [Line Items] |  |  |  |  |  |  |  |
Proportion of ownership interests held by non-controlling interests |  |  |  | 61.50% |  |  |  |
Argentina |  |  |  |  |  |  |  |
Disclosure Of Major Components Of Tax Expense (Income) [Line Items] |  |  |  |  |  |  |  |
Deferred tax expense (income) |  |  |  | $ 35 |  |  |  |
Applicable tax rate |  |  |  | 30.00% |  | 30.00% | 30.00% | 35.00%
Tax on dividend distributions |  |  |  | 13.00% |  | 7.00% | 7.00% |
Proposed corporate tax rate |  |  |  | 25.00% |  |  |  |
Argentina | MALI |  |  |  |  |  |  |  |
Disclosure Of Major Components Of Tax Expense (Income) [Line Items] |  |  |  |  |  |  |  |
Net currency translation losses on deferred tax balances |  |  |  | $ 1 |  |  |  |
TANZANIA, UNITED REPUBLIC OF |  |  |  |  |  |  |  |
Disclosure Of Major Components Of Tax Expense (Income) [Line Items] |  |  |  |  |  |  |  |
Current tax expense (income) |  | $ 21 |  |  |  |  |  |
Deferred tax expense (income) | $ 8 | $ 44 |  |  |  |  |  |

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