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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