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INCOME TAX EXPENSE - Narrative (Details) - USD ($) $ in Millions |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jan. 24, 2020 | Oct. 19, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure Of Major Components Of Tax Expense (Income) [Line Items] |  |  |  |  |  |  |  |  |
Net currency translation losses on deferred tax balances |  |  |  |  |  | $ 43 | $ 41 |  |
Tax Cuts And Jobs Act Of 2017, Incomplete Accounting, Transition Tax For Accumulated Foreign Earnings, Provisional Income Tax Expense |  |  |  |  |  | 0 | 49 |  |
Income tax expense (recovery) |  |  |  |  |  | 1,783 | 1,198 |  |
Current tax expense (income) and adjustments for current tax of prior periods |  |  |  |  |  | 710 | 468 |  |
Current tax expense (income) |  |  |  |  |  | 685 | 423 |  |
Other current assets |  |  | $ 565 | $ 307 |  | 565 | 307 |  |
Gains (losses) on litigation settlements |  |  |  |  |  | 216 | 0 |  |
Acacia Mining PLC |  |  |  |  |  |  |  |  |
Disclosure Of Major Components Of Tax Expense (Income) [Line Items] |  |  |  |  |  |  |  |  |
Income tax expense (recovery) |  |  |  |  |  |  |  | $ 70 | $ 128
Payment to Resolve Outstanding Tax Claims |  |  |  | 300 |  |  | 300 |  |
Current tax expense (income) |  |  |  |  | $ 172 |  |  |  |
UNITED STATES |  |  |  |  |  |  |  |  |
Disclosure Of Major Components Of Tax Expense (Income) [Line Items] |  |  |  |  |  |  |  |  |
Deferred tax expense (income) |  |  |  | 107 |  |  |  |  |
Zambia |  |  |  |  |  |  |  |  |
Disclosure Of Major Components Of Tax Expense (Income) [Line Items] |  |  |  |  |  |  |  |  |
Net currency translation losses on deferred tax balances |  |  |  |  |  | 75 | $ 41 |  |
CANADA |  |  |  |  |  |  |  |  |
Disclosure Of Major Components Of Tax Expense (Income) [Line Items] |  |  |  |  |  |  |  |  |
Deferred tax expense (income) |  |  |  | 0 |  |  |  |  |
PERU |  |  |  |  |  |  |  |  |
Disclosure Of Major Components Of Tax Expense (Income) [Line Items] |  |  |  |  |  |  |  |  |
Deferred tax expense (income) |  |  |  | $ 0 |  |  |  |  |
ZAMBIA | Lumwana mine [Member] |  |  |  |  |  |  |  |  |
Disclosure Of Major Components Of Tax Expense (Income) [Line Items] |  |  |  |  |  |  |  |  |
Other current assets |  |  | 50 |  |  | 50 |  |  |
Nevada Gold Mines [Member] |  |  |  |  |  |  |  |  |
Disclosure Of Major Components Of Tax Expense (Income) [Line Items] |  |  |  |  |  |  |  |  |
Income tax expense (recovery) |  |  | 30 |  |  |  |  |  |
TANZANIA, UNITED REPUBLIC OF |  |  |  |  |  |  |  |  |
Disclosure Of Major Components Of Tax Expense (Income) [Line Items] |  |  |  |  |  |  |  |  |
Payment to Resolve Outstanding Tax Claims |  |  | 300 |  |  | 300 |  |  |
Initial upfront payment |  |  |  |  |  | 100 |  |  |
Installment Payment To Resolve Outstanding Tax Claims |  |  | $ 40 |  |  | $ 40 |  |  |
Tax contingent liability [member] | Tanzanian Revenue Authority Assessments [Member] | Acacia Mining PLC |  |  |  |  |  |  |  |  |
Disclosure Of Major Components Of Tax Expense (Income) [Line Items] |  |  |  |  |  |  |  |  |
Economic Benefit Shared With Government | 5000.00% | 5000.00% |  |  |  |  |  |  |

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