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INCOME TAX EXPENSE - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Oct. 19, 2017
Disclosure Of Major Components Of Tax Expense (Income) [Line Items] |  |  |  |  |
Net currency translation losses on deferred tax balances |  |  | $ 10 | $ 23 |
Change in tax rate, deferred tax recovery | $ 343 |  |  |  |
Toll charge | 228 |  |  |  |
Deferred tax asset on AMT credit to offset liability | 88 |  | 88 |  |
Toll charge payable | 140 |  | 140 |  |
Noncurrent toll charge payable | 129 |  | 129 |  |
Income tax expense (recovery) |  |  | 1,231 | 917 |
Increase in provisional liability | 252 |  |  |  |
Provisional income tax expense | 150 |  |  |  |
Deferred tax expense, undistributed foreign earnings | 102 |  |  |  |
Deferred tax liability, non-current | $ 130 |  | 130 |  |
Acacia Mining PLC |  |  |  |  |
Disclosure Of Major Components Of Tax Expense (Income) [Line Items] |  |  |  |  |
Foreign income tax liability |  |  |  |  | $ 300
Income tax provision |  |  |  | 128 |
Income tax expense (recovery) |  | $ 172 |  | 70 |
Argentina |  |  |  |  |
Disclosure Of Major Components Of Tax Expense (Income) [Line Items] |  |  |  |  |
Net currency translation losses on deferred tax balances |  |  | $ 10 | $ 23 |

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