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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