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INCOME TAX EXPENSE - Narrative (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Jan. 24, 2020
Oct. 19, 2017
Dec. 31, 2019
Dec. 31, 2018
Sep. 30, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2016
Dec. 31, 2015
Disclosure Of Major Components Of Tax Expense (Income) [Line Items]                  
Net currency translation losses on deferred tax balances           $ 43 $ 41    
Tax Cuts And Jobs Act Of 2017, Incomplete Accounting, Transition Tax For Accumulated Foreign Earnings, Provisional Income Tax Expense           0 49    
Income tax expense (recovery)           1,783 1,198    
Current tax expense (income) and adjustments for current tax of prior periods           710 468    
Current tax expense (income)           685 423    
Other current assets     $ 565 $ 307   565 307    
Gains (losses) on litigation settlements           216 0    
Acacia Mining PLC                  
Disclosure Of Major Components Of Tax Expense (Income) [Line Items]                  
Income tax expense (recovery)               $ 70 $ 128
Payment to Resolve Outstanding Tax Claims       300     300    
Current tax expense (income)         $ 172        
UNITED STATES                  
Disclosure Of Major Components Of Tax Expense (Income) [Line Items]                  
Deferred tax expense (income)       107          
Zambia                  
Disclosure Of Major Components Of Tax Expense (Income) [Line Items]                  
Net currency translation losses on deferred tax balances           75 $ 41    
CANADA                  
Disclosure Of Major Components Of Tax Expense (Income) [Line Items]                  
Deferred tax expense (income)       0          
PERU                  
Disclosure Of Major Components Of Tax Expense (Income) [Line Items]                  
Deferred tax expense (income)       $ 0          
ZAMBIA | Lumwana mine [Member]                  
Disclosure Of Major Components Of Tax Expense (Income) [Line Items]                  
Other current assets     50     50      
Nevada Gold Mines [Member]                  
Disclosure Of Major Components Of Tax Expense (Income) [Line Items]                  
Income tax expense (recovery)     30            
TANZANIA, UNITED REPUBLIC OF                  
Disclosure Of Major Components Of Tax Expense (Income) [Line Items]                  
Payment to Resolve Outstanding Tax Claims     300     300      
Initial upfront payment           100      
Installment Payment To Resolve Outstanding Tax Claims     $ 40     $ 40      
Tax contingent liability [member] | Tanzanian Revenue Authority Assessments [Member] | Acacia Mining PLC                  
Disclosure Of Major Components Of Tax Expense (Income) [Line Items]                  
Economic Benefit Shared With Government 5000.00% 5000.00%