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INCOME TAX EXPENSE - Reconciliation to Canadian Statutory Rate (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Income Tax [Abstract]    
At 26.5% statutory rate $ 728 $ 471
Statutory rate (as percent) 26.50% 26.50%
Increase (decrease) due to:    
Allowances and special tax deductions $ (96) $ (134)
Impact of foreign tax rates 215 113
Expenses not tax deductible 24 54
Non-taxable gains on sales of long-lived assets (241) 0
Impairment charges not recognized in deferred tax assets 66 0
Net currency translation losses on deferred tax balances 10 23
Tax impact of profits from equity accounted investments (7) (5)
Current year tax losses not recognized in deferred tax assets 21 35
United States tax reform (203) 0
Non-recognition of US AMT credits 0 13
Adjustments in respect of prior years (6) (4)
Increase to income tax related contingent liabilities 172 70
Impact of tax rate changes 0 (13)
United States withholding taxes 252 0
Other withholding taxes 18 11
Mining taxes 266 267
Other items 12 16
Income tax expense $ 1,231 $ 917