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INCOME TAX EXPENSE - Reconciliation to Canadian Statutory Rate (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017
Income Tax [Abstract] |  |  |
At 26.5% statutory rate |  | $ (63) | $ 728
Statutory rate (as percent) |  | 26.50% | 26.50%
Increase (decrease) due to: |  |  |
Allowances and special tax deductions |  | $ (59) | $ (96)
Impact of foreign tax rates |  | (4) | 215
Expenses not tax deductible |  | 74 | 24
Non-taxable gains on sales of long-lived assets |  | 0 | (241)
Impairment charges not recognized in deferred tax assets |  | 168 | 66
Tax effect of impairment of goodwill |  | 54 | 0
Net currency translation losses on deferred tax balances |  | 41 | 10
Tax impact of profits from equity accounted investments |  | (15) | (7)
Current year tax losses not recognized in deferred tax assets |  | 100 | 21
United States tax reform |  | 0 | (203)
Tax Effect from De-recognition in Deferred Tax Assets |  | 814 | 0
One time toll charge | $ 228 | (49) | 0
Adjustments in respect of prior years |  | 3 | (6)
Increase to income tax related contingent liabilities |  | 0 | 172
Dominican Republic Tax audit |  | 42 | 0
United States withholding taxes |  | (107) | 252
Other withholding taxes |  | 14 | 18
Mining taxes |  | 184 | 266
Other items |  | 1 | 12
Income tax expense |  | $ 1,198 | $ 1,231

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